| Author | Title | Year | Journal/Proceedings |
|---|---|---|---|
| Des Francs, G. C., Girard, C., Bruyant, A. & Dereux, A. | SNOM signal near plasmonic nanostructures: an analogy with fluorescence decays channels | 2008 | Journal Of Microscopy-Oxford |
| Abstract: Scanning Near-field Optical Microscope (SNOM) is based on local excitations of nanostructures deposited on a substrate (illumination mode). Ideally, the local source behaves like a dipolar emitter so that the SNOM signal is strongly similar to the fluorescence decay rates of an excited molecule that would be located at the SNOM tip position. We present here how the SNOM signal near plasmonic nanostructures can be used to analyze radiative and non-radiative contribution to the fluorescence decay rate. | |||
BibTeX:
@article{Des2008,
author = {Des Francs, G. C. and Girard, C. and Bruyant, A. and Dereux, A.},
title = {SNOM signal near plasmonic nanostructures: an analogy with fluorescence decays channels},
journal = {Journal Of Microscopy-Oxford},
year = {2008},
volume = {229},
number = {2},
pages = {302--306}
}
|
|||
| Francs, G. C. D., Sanchez-Mosteiro, G., Ujue-Gonzalez, M., Markey, L., Van Hulst, N. & Dereux, A. | Single molecules probe local density of modes (LDOS) around photonic nanostructures | 2008 | Journal Of Microscopy-Oxford |
| Abstract: According to Fermi's golden rule, the fluorescence decay rate is directly proportional to the projected local density of photonic modes (LDOS) at the molecule location. The relevant LDOS depends on the molecule orientation. In this paper, the direct measurement of the fluorescence lifetime near gold dot photonic structures is investigated and compared to calculated LDOS. Detailed analysis of the decay channels is presented on the basis of numerical simulations. | |||
BibTeX:
@article{Francs2008,
author = {Francs, G. C. D. and Sanchez-Mosteiro, G. and Ujue-Gonzalez, M. and Markey, L. and Van Hulst, N. and Dereux, A.},
title = {Single molecules probe local density of modes (LDOS) around photonic nanostructures},
journal = {Journal Of Microscopy-Oxford},
year = {2008},
volume = {229},
number = {2},
pages = {210--216}
}
|
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| Holmgaard, T., Bozhevolnyi, S. I., Markey, L. & Dereux, A. | Dielectric-loaded surface plasmon-polariton waveguides at telecommunication wavelengths: Excitation and characterization - art. no. 011124 | 2008 | Applied Physics Letters |
| Abstract: The excitation and propagation of strongly confined surface plasmon-polariton (SPP) waveguide modes, supported by 500-nm-wide and 550-nm-high dielectric ridges fabricated on smooth gold films, are investigated at telecommunication wavelengths using a scanning near-field optical microscope. Different tapering structures for coupling of SPPs, excited at bare gold surfaces, into dielectric-loaded SPP waveguide (DLSPPW) modes are considered. The DLSPPW mode confinement and propagation loss are characterized. The DLSPPW mode propagation along an S bend having the smallest curvature radius of 2.48 mu m is shown, demonstrating the potential of DLSPPW technology for the realization of high-density photonic integrated circuits. (c) 2008 American Institute of Physics. | |||
BibTeX:
@article{Holmgaard2008,
author = {Holmgaard, T. and Bozhevolnyi, S. I. and Markey, L. and Dereux, A.},
title = {Dielectric-loaded surface plasmon-polariton waveguides at telecommunication wavelengths: Excitation and characterization - art. no. 011124},
journal = {Applied Physics Letters},
year = {2008},
volume = {92},
number = {1},
pages = {11124--11124}
}
|
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| Huang, C., Bouhelier, A., Francs, G. C., Legay, G., Weeber, J. C. & Dereux, A. | Far-field imaging of the electromagnetic local density of optical states | 2008 | Optics Letters |
| Abstract: We introduce a new experimental method to measure the local electromagnetic density of states (LDOS) by integrating the differential scattering cross section. The signal detected essentially reflects the intrinsic scattering response of the photonic structures and renders the partial LDOS dominated by evanescent modes. We give a theoretical understanding of the LDOS image formation and show a qualitative agreement between experimental images and theoretical maps. This approach can be practically applied to the direct measurement of an optical antenna's scattering efficiency and can provide valuable information for designing optimum structures utilized in radiative decay engineering. (c) 2008 Optical Society of America. | |||
BibTeX:
@article{Huang2008,
author = {Huang, C. and Bouhelier, A. and Francs, G. C. and Legay, G. and Weeber, J. C. and Dereux, A.},
title = {Far-field imaging of the electromagnetic local density of optical states},
journal = {Optics Letters},
year = {2008},
volume = {33},
number = {4},
pages = {300--302}
}
|
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| Lopez-Tejeira, F., Rodrigo, S. G., Martin-Moreno, L., Garcia-Vidal, F. J., Devaux, E., Dintinger, J., Ebbesen, T. W., Krenn, J. R., Radko, I. P., Bozhevolnyi, S. I., Gonzalez, M. U., Weeber, J. C. & Dereux, A. | Modulation of surface plasmon coupling-in by one-dimensional surface corrugation - art. no. 033035 | 2008 | New Journal Of Physics |
| Abstract: Surface plasmon-polaritons have recently attracted renewed interest in the scientific community for their potential in sub-wavelength optics, light generation and non-destructive sensing. Given that they cannot be directly excited by freely propagating light due to their intrinsic binding to the metal surface, the light - plasmon coupling efficiency becomes of crucial importance for the success of any plasmonic device. Here, we present a comprehensive study on the modulation ( enhancement or suppression) of such a coupling efficiency by means of one-dimensional surface corrugation. Our approach is based on simple wave interference and enables us to make quantitative predictions which have been experimentally confirmed at both the near-infrared and telecom ranges. | |||
BibTeX:
@article{Lopez-Tejeira2008,
author = {Lopez-Tejeira, F. and Rodrigo, S. G. and Martin-Moreno, L. and Garcia-Vidal, F. J. and Devaux, E. and Dintinger, J. and Ebbesen, T. W. and Krenn, J. R. and Radko, I. P. and Bozhevolnyi, S. I. and Gonzalez, M. U. and Weeber, J. C. and Dereux, A.},
title = {Modulation of surface plasmon coupling-in by one-dimensional surface corrugation - art. no. 033035},
journal = {New Journal Of Physics},
year = {2008},
volume = {10},
pages = {33035--33035}
}
|
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| Taverna, D., Kociak, M., Stephan, O., Fabre, A., Finot, E., Decamps, B. & Colliex, C. | Probing physical properties of confined fluids within individual nanobubbles - art. no. 035301 | 2008 | Physical Review Letters |
| Abstract: Spatially resolved electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM) has been used to investigate a He fluidic phase in nanobubbles embedded in a metallic Pd90Pt10 matrix. Using the 1s -> 2p excitation of the He atoms, maps of the He density and pressure in bubbles of different diameters have been realized, to provide an indication of the bubble formation mechanism. Detailed local variations of the He K-line characteristics have been measured and interpreted as modifications of the electromagnetic properties of the He atom close to a metallic interface, which affects a correct estimation of the densities within the smallest bubbles. | |||
BibTeX:
@article{Taverna2008,
author = {Taverna, D. and Kociak, M. and Stephan, O. and Fabre, A. and Finot, E. and Decamps, B. and Colliex, C.},
title = {Probing physical properties of confined fluids within individual nanobubbles - art. no. 035301},
journal = {Physical Review Letters},
year = {2008},
volume = {100},
number = {3},
pages = {5301--5301}
}
|
|||
| Wiederrecht, G. P., Wurtz, G. A. & Bouhelier, A. | Ultrafast hybrid plasmonics | 2008 | Chemical Physics Letters |
| Abstract: We review our recent studies of electromagnetic coupling and associated temporal dynamics of molecular excitations with plasmonic resonances supported by either localized or extended planar geometries. We focus on coherent interactions between plasmon resonances and molecular excitations, which are experimentally challenging due to the very short (similar to 10-100 fs) coherence times of plasmons. Recent experimental results and theoretical analysis for observing and controlling coherences between molecular excitations and plasmonic polarizations are shown. Advances will explore new directions in ultrafast coherent control of molecular excited states and energy dissipation processes, as well as ultrafast addressing and switching in plasmonics-based circuit architectures. (C) 2008 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Wiederrecht2008,
author = {Wiederrecht, G. P. and Wurtz, G. A. and Bouhelier, A.},
title = {Ultrafast hybrid plasmonics},
journal = {Chemical Physics Letters},
year = {2008},
volume = {461},
number = {4-6},
pages = {171--179}
}
|
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| Bouhelier, A., Ignatovich, F., Bruyant, A., Huang, C., Francs, G. C. D., Weeber, J. C., Dereux, A., Wiederrecht, G. P. & Novotny, L. | Surface plasmon interference excited by tightly focused laser beams | 2007 | Optics Letters |
| Abstract: We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spectrum representation and provide a simple means for locally exciting standing surface plasmon polaritons. (c) 2007 Optical Society of America. | |||
BibTeX:
@article{Bouhelier2007,
author = {Bouhelier, A. and Ignatovich, F. and Bruyant, A. and Huang, C. and Francs, G. C. D. and Weeber, J. C. and Dereux, A. and Wiederrecht, G. P. and Novotny, L.},
title = {Surface plasmon interference excited by tightly focused laser beams},
journal = {Optics Letters},
year = {2007},
volume = {32},
number = {17},
pages = {2535--2537}
}
|
|||
| Gonzalez, M. U., Stepanov, A. L., Weeber, J. C., Hohenau, A., Dereux, A., Quidant, R. & Krenn, J. R. | Analysis of the angular acceptance of surface plasmon Bragg mirrors | 2007 | Optics Letters |
| Abstract: We analyze an important aspect of the behavior of surface plasmon polariton (SPP) Bragg mirrors: the dependence of the angular acceptance for reflection on the incidence angle. By means of leakage radiation microscopy, both in direct and Fourier space, we observe that the angular acceptance diminishes for increasing incidence angles. This effect, which can considerably affect the design of devices based on these elements, is shown to be the consequence of the decrease of the bandgap width with increasing incidence angle. (c) 2007 Optical Society of America. | |||
BibTeX:
@article{Gonzalez2007,
author = {Gonzalez, M. U. and Stepanov, A. L. and Weeber, J. C. and Hohenau, A. and Dereux, A. and Quidant, R. and Krenn, J. R.},
title = {Analysis of the angular acceptance of surface plasmon Bragg mirrors},
journal = {Optics Letters},
year = {2007},
volume = {32},
number = {18},
pages = {2704--2706}
}
|
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| Kempf, D., Vignal, V., Cailletaud, G., Oltra, R., Weeber, J. C. & Finot, E. | High spatial resolution strain measurements at the surface of duplex stainless steels | 2007 | Philosophical Magazine |
| Abstract: The determination of local strain fields at the Surface of materials is of major importance for understanding their reactivity. In the present paper, lithography is used to fabricate grid points at the microscale and to map strain gradients within grains and between grains. This method was applied to duplex stainless steels which exhibit heterogeneous strain distributions under straining conditions. The influence of various parameters (the specimen microstructure, the density of slip bands, the number of systems activated and the grid geometry) on the strain value is discussed. | |||
BibTeX:
@article{Kempf2007,
author = {Kempf, D. and Vignal, V. and Cailletaud, G. and Oltra, R. and Weeber, J. C. and Finot, E.},
title = {High spatial resolution strain measurements at the surface of duplex stainless steels},
journal = {Philosophical Magazine},
year = {2007},
volume = {87},
number = {8-9},
pages = {1379--1399}
}
|
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| Lakard, S., Lesniewska, E., Michel, G., Lakard, B., Morrand-Villeneuve, N. & Versaux-Botteri, C. | In vitro induction of differentiation by retinoic acid in an immortalized olfactory neuronal cell line | 2007 | Acta Histochemica |
| Abstract: In this study, we used a neuronal. cell tine generated by transfection of rat olfactory epithelium with immortalizing recombinant oncogene E1A of adenovirus-2. The resulting 13.S.1.24 line of transformed cells expressed an antigenic phenotype of olfactory neuronal. progenitors. Time-dependency assessments over 1 week of treatment indicated that apoptosis and differentiation induced by retinoic acid (RA) were concomitant. Indeed, RA altered the cell proliferation rate, but it also stimulated differentiation of surviving 13.S.1.24 cells into bipolar olfactory marker protein-immunoreactive neurons. To characterize the nature of the cells we used immunocytochemistry, optical imaging, scanning electron microscopy and atomic force microscopy. (c) 2006 Elsevier GmbH. All rights reserved. | |||
BibTeX:
@article{Lakard2007,
author = {Lakard, S. and Lesniewska, E. and Michel, G. and Lakard, B. and Morrand-Villeneuve, N. and Versaux-Botteri, C.},
title = {In vitro induction of differentiation by retinoic acid in an immortalized olfactory neuronal cell line},
journal = {Acta Histochemica},
year = {2007},
volume = {109},
number = {2},
pages = {111--121}
}
|
|||
| Lakard, S., Morrand-Villeneuve, N., Lesniewska, E., Lakard, B., Michel, G., Herlem, G., Gharbi, T. & Fahys, B. | Synthesis of polymer materials for use as cell culture substrates | 2007 | Electrochimica Acta |
| Abstract: Up to today, several techniques have been used to maintain cells in culture for studying many aspects of cell biology and physiology. More often, cell culture is dependent on proper anchorage of cells to the growth surface. Thus, poly-L-lysine, fibronectin or laminin are the most commonly used substrates. In this study, electrosynthesized biocompatible polymer films are proposed as an alternative to these standard substrates. The electrosynthesized polymers tested were polyethylenimine, polypropylenimme and polypyrrole. Then, the adhesion, proliferation and morphology of rat neuronal cell lines were investigated on these polymer substrates in an attempt to develop new and efficient polymer materials for cell culture. During their growth on the polymers, the evolution of the cell morphology was monitored using both confocal microscopy and immunohistochemistry, leading to the conclusion of a normal development. An estimation of the adhesion and proliferation rates of rat neuronal cell cultures indicated that polyethylenimine and polypropylenimine were the best substrates for culturing olfactory neuronal cells. A method to favour the differentiation of the neuronal cells was also developed since the final aim of this work is to develop a biosensor for odour detection using differentiated neuronal cells as transducers. Consequently, a biosensor was microfabricated using silicon technology. This microsystem allowed us to culture the cells on a silicon wafer and to position the cells on certain parts of the silicon wafer. (c) 2007 Elsevier Ltd. All rights reserved. | |||
BibTeX:
@article{Lakard2007a,
author = {Lakard, S. and Morrand-Villeneuve, N. and Lesniewska, E. and Lakard, B. and Michel, G. and Herlem, G. and Gharbi, T. and Fahys, B.},
title = {Synthesis of polymer materials for use as cell culture substrates},
journal = {Electrochimica Acta},
year = {2007},
volume = {53},
number = {3},
pages = {1114--1126}
}
|
|||
| Laluet, J. Y., Devaux, E., Genet, C., Ebbesen, T. W., Weeber, J. C. & Dereux, A. | Optimization of surface plasmons launching from subwavelength hole arrays: modelling and experiments | 2007 | Optics Express |
| Abstract: The launching of surface plasmons by micro-gratings of subwavelength apertures milled in a thick metal film is important for the development of surface plasmon based circuits. By comparing the near-field optical images of such surface plasmon sources with the results of a Huygens-Fresnel principle based scattering model, we show that the properties of the locally launched SP beams such as divergence or uniformity can be tuned by adjusting the shape of the micro-gratings. This allows us to propose an optimized source array well adapted for providing a narrow, collimated and uniform beam. (c) 2007 Optical Society of America. | |||
BibTeX:
@article{Laluet2007,
author = {Laluet, J. Y. and Devaux, E. and Genet, C. and Ebbesen, T. W. and Weeber, J. C. and Dereux, A.},
title = {Optimization of surface plasmons launching from subwavelength hole arrays: modelling and experiments},
journal = {Optics Express},
year = {2007},
volume = {15},
number = {6},
pages = {3488--3495}
}
|
|||
| Legay, G., Markey, L., Meunier-Prest, R. & Finot, E. | Measurements of thickness dispersion in biolayers by scanning force microscopy and comparison with spectroscopic ellipsometry analysis | 2007 | Ultramicroscopy |
| Abstract: Measuring the thickness of biological films remains a difficult task when using differential measurements by atomic force microscopy (AFM). The use of microstructured substrates combined with a selective adsorption constitutes an alternative to tribological measurements. The statistical thickness analysis of biological layers, especially via the dispersion measurements, can provide a way to quantify the molecular orientation. AFM thicknesses were then compared with those obtained optically by spectroscopic ellipsometry (SE) and surface plasmon resonance enhanced ellipsometry (SPREE). The biolayers could then be modeled using a vertical gradient of optical index, which reflects height dispersions. Thiol-modified DNA strands of various lengths account for a good biological model for the study of the strand motion in air and in liquid. (c) 2007 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Legay2007,
author = {Legay, G. and Markey, L. and Meunier-Prest, R. and Finot, E.},
title = {Measurements of thickness dispersion in biolayers by scanning force microscopy and comparison with spectroscopic ellipsometry analysis},
journal = {Ultramicroscopy},
year = {2007},
volume = {107},
number = {10-11},
pages = {1111--1117}
}
|
|||
| Leonenko, Z., Finot, E. & Amrein, M. | Adhesive interaction measured between AFM probe and lung epithelial type II cells | 2007 | Ultramicroscopy |
| Abstract: The toxicity of inhaled nanoparticles entering the body through the lung is thought to be initially defined by the electrostatic and adhesive interaction of the particles with lung's wall. Here, we investigated the first step of the interaction of nanoparticles with lung epithelial cells using atomic force microscope (AFM) as a force apparatus. Nanoparticles were modeled by the apex of the AFM tip and the forces of interaction between the tip and the cell analyzed over time. The adhesive force and work of adhesion strongly increased for the first 100 s of contact and then leveled out. During this time, the tip was penetrating deeply into the cell. It first crossed a stiff region of the cell and then entered a much more compliant cell region. The work of adhesion and its progression over time were not dependent on the load with which the tip was brought into contact with the cell. We conclude that the initial thermodynamic aspects and the time course of the uptake of nanoparticles by lung epithelial cells can be studied using our experimental approach. It is discussed how the potential health threat posed by nanoparticles of different size and surface characteristics can be evaluated using the method presented. (c) 2007 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Leonenko2007,
author = {Leonenko, Z. and Finot, E. and Amrein, M.},
title = {Adhesive interaction measured between AFM probe and lung epithelial type II cells},
journal = {Ultramicroscopy},
year = {2007},
volume = {107},
number = {10-11},
pages = {948--953}
}
|
|||
| Lopez-Tejeira, F., Rodrigo, S. G., Martin-Moreno, L., Garcia-Vidal, F. J., Devaux, E., Ebbesen, T. W., Krenn, J. R., Radko, I. P., Bozhevolnyi, S. I., Gonzalez, M. U., Weeber, J. C. & Dereux, A. | Efficient unidirectional nanoslit couplers for surface plasmons | 2007 | Nature Physics |
| Abstract: The emerging field of plasmonics is based on exploiting the coupling between light and collective electronic excitations within conducting materials known as surface plasmons. Because the so-called surface plasmon polariton (SPP) modes that arise from this coupling are not constrained by the optical diffraction limit, it is hoped that they could enable the construction of ultracompact optical components(1,2). But in order that such potential can be realized, it is vital that the relatively poor light - SPP coupling be improved. This is made worse by the fact that the incident light that is conventionally used to launch SPPs in a metal film(3-6) is a significant source of noise, unless directed away from a region of interest, which then decreases the signal and increases the system's size. Back-side illumination of subwavelength apertures in optically thick metal films(7-13) eliminates this problem but does not ensure a unique propagation direction for the SPP. We propose a novel back-side slit-illumination method that incorporates a periodic array of grooves carved into the front side of a thick metal film. Bragg reflection enhances the propagation of SPPs away from the array, enabling them to be unidirectionally launched from, and focused to, a localized point. | |||
BibTeX:
@article{Lopez-Tejeira2007,
author = {Lopez-Tejeira, F. and Rodrigo, S. G. and Martin-Moreno, L. and Garcia-Vidal, F. J. and Devaux, E. and Ebbesen, T. W. and Krenn, J. R. and Radko, I. P. and Bozhevolnyi, S. I. and Gonzalez, M. U. and Weeber, J. C. and Dereux, A.},
title = {Efficient unidirectional nanoslit couplers for surface plasmons},
journal = {Nature Physics},
year = {2007},
volume = {3},
number = {5},
pages = {324--328}
}
|
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| Mary, A., Koller, D. M., Hohenau, A., Krenn, J. R., Bouhelier, A. & Dereux, A. | Optical absorption of torus-shaped metal nanoparticles in the visible range - art. no. 245422 | 2007 | Physical Review B |
| Abstract: We theoretically and experimentally investigated the optical response of a thin metal nanotorus in the visible range. The close formulas describing the extinction cross sections of a torus are obtained in the nonretarded approximation. We demonstrate a good agreement between numerical simulations and experimental data. Our findings show that the main resonance is highly sensitive to the external medium and the geometrical parameters of the particle. | |||
BibTeX:
@article{Mary2007,
author = {Mary, A. and Koller, D. M. and Hohenau, A. and Krenn, J. R. and Bouhelier, A. and Dereux, A.},
title = {Optical absorption of torus-shaped metal nanoparticles in the visible range - art. no. 245422},
journal = {Physical Review B},
year = {2007},
volume = {76},
number = {24},
pages = {5422--5422}
}
|
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| Massenot, S., Grandidier, J., Bouhelier, A., des Francs, G. C., Markey, L., Weeber, J. C., Dereux, A., Renger, J., Gonzalez, M. U. & Quidant, R. | Polymer-metal waveguides characterization by Fourier plane leakage radiation microscopy - art. no. 243102 | 2007 | Applied Physics Letters |
| Abstract: The guiding properties of polymer waveguides on a thin gold film are investigated in the optical regime. The details of propagation in the waveguides are studied simultaneously in the object and Fourier planes, providing direct measurement of both the real and imaginary parts of the effective index of the guided mode. A fair agreement between theoretical analysis provided by the differential method and experimental leakage radiation microscopy data is shown. All these tools bring valuable information for designing and understanding such devices. (C) 2007 American Institute of Physics. | |||
BibTeX:
@article{Massenot2007,
author = {Massenot, S. and Grandidier, J. and Bouhelier, A. and des Francs, G. C. and Markey, L. and Weeber, J. C. and Dereux, A. and Renger, J. and Gonzalez, M. U. and Quidant, R.},
title = {Polymer-metal waveguides characterization by Fourier plane leakage radiation microscopy - art. no. 243102},
journal = {Applied Physics Letters},
year = {2007},
volume = {91},
number = {24},
pages = {43102--43102}
}
|
|||
| Mertens, J., Finot, E., Heintz, O., Nadal, M. H., Eyraud, V., Cathelat, A., Legay, G., Bourillot, E. & Dereux, A. | Changes in surface stress, morphology and chemical composition of silica and silicon nitride surfaces during the etching by gaseous HF acid | 2007 | Applied Surface Science |
| Abstract: HF acid attack of SiO2 and Si3N4 substrates is analyzed to improve the sensitivity of a sensor based on inicrocantilever. Ex situ analysis of the etching using XPS, SIMS and AFM show significant changes in the anisotropy and the rate of the etching of the oxides on SiO2 and Si3N4 surface. Those differences influence the kinetic evolution of the plastic bending deflection of the cantilever coated with SiO2 and Si3N4 layer, respectively. The linear dependence between the HF concentration and the Si3N4 cantilever bending corresponds to a deep attack of the layer whereas the nonlinear behavior observed for SiO2 layer can be explained by a combination of deep and lateral etchina. The cantilever bending is discussed in terms of free surface energy, layer thickness and grain size. (c) 2006 Elsevier B.V All rights reserved. | |||
BibTeX:
@article{Mertens2007,
author = {Mertens, J. and Finot, E. and Heintz, O. and Nadal, M. H. and Eyraud, V. and Cathelat, A. and Legay, G. and Bourillot, E. and Dereux, A.},
title = {Changes in surface stress, morphology and chemical composition of silica and silicon nitride surfaces during the etching by gaseous HF acid},
journal = {Applied Surface Science},
year = {2007},
volume = {253},
number = {11},
pages = {5101--5108}
}
|
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| Ndobo-Epoy, J. P., Lesniewska, E. & Guicquero, J. P. | Nano-pH sensor for the study of reactive materials | 2007 | Analytical Chemistry |
| Abstract: We report the development of a new iridium oxide nano-pH sensor designed to work in the range of pH 3-14. The fabrication process of reproducible iridium. nanotips is described. The nanotips are covered by an insulating layer of parylene to ensure a chemical insulation. The use of a gallium focused ion beam enables the opening of the apex, leading to a sensing area of 100 nm diameter. A 12 h oxidation of the iridium tip in an oxygen atmosphere gives in a stable pH response. The calibration curve in buffer solutions exhibited a Nernstian behavior (slope 59.2 mV/pH). The distance control between the sample and the nanosensor is performed by atomic force microscopy (AFM), using either a shear force control or an inverted AFM configuration. The results of the hydration of two reactive samples, tricalcium silicate and tricalcium. aluminate, having a size of 50 mu m only, are presented. | |||
BibTeX:
@article{Ndobo-Epoy2007,
author = {Ndobo-Epoy, J. P. and Lesniewska, E. and Guicquero, J. P.},
title = {Nano-pH sensor for the study of reactive materials},
journal = {Analytical Chemistry},
year = {2007},
volume = {79},
number = {19},
pages = {7560--7564}
}
|
|||
| Vajda, S., Wiederrecht, G. P., Bouhelier, A., Tikhonov, G. Y., Tomczyk, N., Lee, B., Seifert, S. & Winans, R. E. | Optical properties of gold nanoparticles produced by the assembly of size-selected clusters: Covering the full visible wavelength range in the smallest particle size regime | 2007 | Collection Of Czechoslovak Chemical Communications |
| Abstract: The tunability of the optical properties of small gold nanoparticles assembled from size-selected Au6-10 clusters on the surface of indium-tin-oxide glass support was studied as a function of gold particle size and shape using UV-VIS and dark-field microscopy techniques. The size and shape of gold nanoparticles was determined by employing synchrotron X-ray scattering. The obtained spectra show that a 350 nm wavelength range is accessible by proper tuning the size and shape of the studied nanoparticles with 1-2.5 nm main size and asymmetric vs symmetric form. | |||
BibTeX:
@article{Vajda2007,
author = {Vajda, S. and Wiederrecht, G. P. and Bouhelier, A. and Tikhonov, G. Y. and Tomczyk, N. and Lee, B. and Seifert, S. and Winans, R. E.},
title = {Optical properties of gold nanoparticles produced by the assembly of size-selected clusters: Covering the full visible wavelength range in the smallest particle size regime},
journal = {Collection Of Czechoslovak Chemical Communications},
year = {2007},
volume = {72},
number = {1},
pages = {121--128}
}
|
|||
| Weeber, J. C., Bouhelier, A., des Francs, G. C., Markey, L. & Dereux, A. | Submicrometer in-plane integrated surface plasmon cavities | 2007 | Nano Letters |
| Abstract: The optical properties of in-plane integrated surface plasmon polariton (SPP) cavities comprised of a thin film area sandwiched between two one-dimensional Bragg SPP mirrors are investigated numerically and experimentally. We discuss the resonance condition of these cavities, and we analyze in details the physical origin of the dispersion of this resonance. On the basis of numerical results, we show that in-plane SPP cavities can be used to achieve local SPP field enhancement and antireflecting SPP layers. The numerical results are compared to near-field optical images recorded by operating a photon scanning tunneling microscope. From the near-field images recorded over cavities with different sizes at different frequencies, we verify the resonance condition obtained numerically and we measure the quality factor of a submicrometer in-plane integrated SPP cavity. | |||
BibTeX:
@article{Weeber2007,
author = {Weeber, J. C. and Bouhelier, A. and des Francs, G. C. and Markey, L. and Dereux, A.},
title = {Submicrometer in-plane integrated surface plasmon cavities},
journal = {Nano Letters},
year = {2007},
volume = {7},
number = {5},
pages = {1352--1359}
}
|
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| Weeber, J. C., Bouhelier, A., des Francs, G. C., Massenot, S., Grandidier, J., Markey, L. & Dereux, A. | Surface-plasmon hopping along coupled coplanar cavities - art. no. 113405 | 2007 | Physical Review B |
| Abstract: We report on surface-plasmon propagation along coupled coplanar cavities periodically distributed in an otherwise unperturbed plasmonic crystal. We show that the dispersion of particular Bloch modes can exhibit multiple energy gaps that can be adjusted by choosing the cavity size. For resonant sizes, the composite crystals composed of juxtaposed cavities can support plasmon modes at frequencies within the gap of the unperturbed grating. In this case, we demonstrate that the surface-plasmon propagation relies on a hopping mechanism. | |||
BibTeX:
@article{Weeber2007a,
author = {Weeber, J. C. and Bouhelier, A. and des Francs, G. C. and Massenot, S. and Grandidier, J. and Markey, L. and Dereux, A.},
title = {Surface-plasmon hopping along coupled coplanar cavities - art. no. 113405},
journal = {Physical Review B},
year = {2007},
volume = {76},
number = {11},
pages = {3405--3405}
}
|
|||
| Wiederrecht, G. P., Hall, J. E. & Bouhelier, A. | Control of molecular energy redistribution pathways via surface plasmon gating - art. no. 083001 | 2007 | Physical Review Letters |
| Abstract: Strong coupling of molecular electronic states with tunable surface plasmon resonances is used to control electronic energy redistribution pathways in molecules adsorbed on a silver film. Ultrafast excitation of porphyrinic molecular J aggregates into the S-2 state is followed by a second pulse of varying incident wave vector to produce a tunable plasmon in the film. When the plasmon overlaps the S-1 state, energy flows from S-2 to S-1 at high efficiency. If the plasmon hybridizes with the S-2 state, the excitation remains in the S-2 vibrational manifold during quenching to the ground state. These results could have significant impact on the design of active molecular devices. | |||
BibTeX:
@article{Wiederrecht2007,
author = {Wiederrecht, G. P. and Hall, J. E. and Bouhelier, A.},
title = {Control of molecular energy redistribution pathways via surface plasmon gating - art. no. 083001},
journal = {Physical Review Letters},
year = {2007},
volume = {98},
number = {8},
pages = {3001--3001}
}
|
|||
| Zaborski, M., Kunert, A., Pietrasik, J., Szynkowska, M. I. & Lesniewska, E. | Intercalated montmorillonites as fillers for acrylonitrile-butadiene rubber | 2007 | Rubber Chemistry And Technology |
| Abstract: Modified montmorillonite was used as filler for NBR. The effect of the montmorillonite structure and its concentration was studied. The composites were prepared with the use of a laboratory two-roll mill. Unmodified montmorillonite (MM_Na) agglomerated in NBR rubber resulting only in small enhancement of mechanical properties. The most effective exfoliation of the montmorillonite was observed for the modifier with two long chains (dihydrotallowdimethylammonium chloride (2M2HT)) and at its higher concentration (0). The modified filler did not agglomerate in NBR. The montmorillonite (MM 2M2HT(C1)) formed a secondary filler network. This very well dispersed network demonstrated the strong reinforcement. Increasing the content of MM_2M2HT(C1) to 20 parts by wt. improved significantly the tensile strength of NBR vulcanizates (tensile strength > 25 MPa). Montmorillonite intercalated with hydrotallowdimethylbenzylammonium chloride (MM_2MBHT) did not improve the properties of the studied materials. | |||
BibTeX:
@article{Zaborski2007,
author = {Zaborski, M. and Kunert, A. and Pietrasik, J. and Szynkowska, M. I. and Lesniewska, E.},
title = {Intercalated montmorillonites as fillers for acrylonitrile-butadiene rubber},
journal = {Rubber Chemistry And Technology},
year = {2007},
volume = {80},
number = {2},
pages = {279--295}
}
|
|||
| Baudrion, A. L., Weeber, J. C., Dereux, A., Lecamp, G., Lalanne, P. & Bozhevolnyi, S. I. | Influence of the filling factor on the spectral properties of plasmonic crystals - art. no. 125406 | 2006 | Physical Review B |
| Abstract: Plasmonics crystals (PCs) comprised of finite-size triangular lattices of gold bumps deposited on a gold thin film are studied by means of a near-field optical microscope. The plasmonic crystals fabricated by electron-beam lithography are illuminated by an incident surface plasmon polariton excited in the Kretschmann-Raether configuration at the gold/air thin-film interface for incident free-space wavelengths in the range 740-820 nm. Based on the measurement of the surface plasmon polariton (SPP) damping distance in the crystals, the existence of a band gap for an incident SPP traveling along the two symmetry axes Gamma M and Gamma K is demonstrated. By increasing the lateral size of the bumps, the influence of the filling factor on the PC spectral properties is investigated. We show that, for the two Gamma M and Gamma K axes, the central gap frequency depends only weakly on the filling factor, whereas we observed a neat band-gap broadening for increasing filling factors. The experimental results are found to be consistent with the PC band structures computed by means of the differential method. In particular, a good agreement between the experimental and theoretical central gap frequencies for the two Gamma M and Gamma K axes is obtained. Finally, we investigate the origin of the band gap in PCs by computing modal reflectivity (or in-plane reflectivity) of semi-infinitely extended crystals. From these calculations, we show that the SPP propagation through a PC is inhibited by distributed reflection and not by losses channels such as absorption or out-of-plane scattering. | |||
BibTeX:
@article{Baudrion2006,
author = {Baudrion, A. L. and Weeber, J. C. and Dereux, A. and Lecamp, G. and Lalanne, P. and Bozhevolnyi, S. I.},
title = {Influence of the filling factor on the spectral properties of plasmonic crystals - art. no. 125406},
journal = {Physical Review B},
year = {2006},
volume = {7412},
number = {12},
pages = {5406--5406}
}
|
|||
| Francs, G. C. D., Girard, C., David, T. & Dereux, A. | Cartography of the local density of surface photonic conditions [BibTeX] |
2006 | Journal De Physique Iv |
BibTeX:
@article{Francs2006,
author = {Francs, G. C. D. and Girard, C. and David, T. and Dereux, A.},
title = {Cartography of the local density of surface photonic conditions},
journal = {Journal De Physique Iv},
year = {2006},
volume = {135},
pages = {129--130}
}
|
|||
| Gonzalez, M. U., Weeber, J. C., Baudrion, A. L., Dereux, A., Stepanov, A. L., Krenn, J. R., Devaux, E. & Ebbesen, T. W. | Design, near-field characterization, and modeling of 45 circle surface-plasmon Bragg mirrors - art. no. 155416 | 2006 | Physical Review B |
| Abstract: The development of surface plasmon polariton (SPP) optical elements is mandatory in order to achieve surface plasmon based photonics. A current approach to reach this goal is to take advantage of the interaction of SPP with defects and design elements obtained by the micro- or nano-structuration of the metal film. In this work, we have performed a detailed study of the performance and behavior of SPP-Bragg mirrors, designed for 45 degrees incidence, based on this approach. Mirrors consisting of gratings of both metal ridges on the metal surface and grooves engraved in the metal, fabricated by means of electron beam lithography and focused ion beam, have been considered. The performance of the mirrors has been characterized via near-field optical microscopy. An original procedure to obtain quantitative values of the mirrors' reflectivity and transmission coefficient from the near-field images is exposed. The mirrors composed of metal ridges are shown to act very efficiently, and a rather low number of elements (15 for the specific geometry studied) is able to deflect almost 100% of the incoming power. Conversely, the arrays of grooves produce a much lower reflectivity, which we attribute mostly to radiative scattering in the forward direction induced by the grooves. Besides, the considered systems have also been simulated by using the differential method. The results obtained from the numerical calculations present an excellent agreement with the experimental data, proving the reliability of this method to predict the behavior of this kind of systems while interacting with SPP. Based on the numerical modeling of the SPP-Bragg mirrors, the evolution of the mirrors' behavior with the ridges height is analyzed. | |||
BibTeX:
@article{Gonzalez2006,
author = {Gonzalez, M. U. and Weeber, J. C. and Baudrion, A. L. and Dereux, A. and Stepanov, A. L. and Krenn, J. R. and Devaux, E. and Ebbesen, T. W.},
title = {Design, near-field characterization, and modeling of 45 circle surface-plasmon Bragg mirrors - art. no. 155416},
journal = {Physical Review B},
year = {2006},
volume = {7315},
number = {15},
pages = {5416--5416}
}
|
|||
| Leonenko, Z., Finot, E. & Cramb, D. | AFM study of interaction forces in supported planar DPPC bilayers in the presence of general anesthetic halothane | 2006 | Biochimica Et Biophysica Acta-Biomembranes |
| Abstract: In spite of numerous investigations, the molecular mechanism of general anesthetics action is still not well understood. It has been shown that the anesthetic potency is related to the ability of an anesthetic to partition into the membrane. We have investigated changes in structure, dynamics and forces of interaction in supported dipalmitoylphosphatidylcholine (DPPC) bilayers in the presence of the general anesthetic halothane. In the present study, we measured the forces of interaction between the probe and the bilayer using an atomic force microscope. The changes in force curves as a function of anesthetic incorporation were analyzed. Force measurements were in good agreement with AFM imaging data, and provided valuable information on bilayer thickness, structural transitions, and halothane-induced changes in electrostatic and adhesive properties. (c) 2006 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Leonenko2006,
author = {Leonenko, Z. and Finot, E. and Cramb, D.},
title = {AFM study of interaction forces in supported planar DPPC bilayers in the presence of general anesthetic halothane},
journal = {Biochimica Et Biophysica Acta-Biomembranes},
year = {2006},
volume = {1758},
number = {4},
pages = {487--492}
}
|
|||
| Leonenko, Z., Finot, E., Vassiliev, V. & Amrein, M. | Effect of cholesterol on the physical properties of pulmonary surfactant films: Atomic force measurements study | 2006 | Ultramicroscopy |
| Abstract: Atomic force measurements were performed on supported pulmonary surfactant (PS) films to address the effect of cholesterol on the physical properties of lung surfactant films. We recently found that cholesterol in excess of a physiological proportion abolishes surfactant function, and is the reason that surfactant fails to lower the surface tension upon compression. In this study, we investigated how the loss of mechanical stability observed earlier is related to the local mechanical properties of the film by local force measurements. The presence of 20% of cholesterol in bovine lipid extract surfactant (BLES) resulted in a decrease of the observed adhesive interaction, and an increase in rigidity of the film. We discuss the implication the increased rigidity might have on the functional failure of PS. (c) 2006 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Leonenko2006a,
author = {Leonenko, Z. and Finot, E. and Vassiliev, V. and Amrein, M.},
title = {Effect of cholesterol on the physical properties of pulmonary surfactant films: Atomic force measurements study},
journal = {Ultramicroscopy},
year = {2006},
volume = {106},
number = {8-9},
pages = {687--694}
}
|
|||
| Monoy, A., Brevet, A., Imhoff, L., Domenichini, B., Lesniewska, E., Peterle, P. M., de Lucas, M. C. M. & Bourgeois, S. | Surface preparation influence on the initial stages of MOCVD growth of TiO2 thin films | 2006 | Thin Solid Films |
| Abstract: In situ chemical surface analyses using X-ray photoelectron spectroscopy (XPS), completed by ex situ atomic force microscopy (AFM) analyses, were performed in order to compare the initial stages of MOCVD growth of TiO2 thin films on two different surface types. The first type was a silicon native oxide free hydrogen terminated surface and the second one was a silicon dioxide surface corresponding to a thin layer of 3.5 nm thick in situ thermally grown on silicon substrate. Si(100) was used as substrate, and the growths of TiO2 thin films were achieved with titanium tetraisopropoxide (TTIP) as precursor under a temperature of 675 degrees C, a pressure of 0.3 Pa and a deposition time of 1 h. Whatever the surface is, the deposited titanium amount was globally the same in the two cases. On the contrary, the deposit morphology was different: a covering layer composed of a SiO2 and TiO2 phases mixture on the hydrogen terminated surface, and small TiO2 clusters homogeneously spread on the SiO2 surface. (c) 2005 Elsevier B.V. All rights reserved. | |||
BibTeX:
@article{Monoy2006,
author = {Monoy, A. and Brevet, A. and Imhoff, L. and Domenichini, B. and Lesniewska, E. and Peterle, P. M. and de Lucas, M. C. M. and Bourgeois, S.},
title = {Surface preparation influence on the initial stages of MOCVD growth of TiO2 thin films},
journal = {Thin Solid Films},
year = {2006},
volume = {515},
number = {2},
pages = {687--690}
}
|
|||
| Shamrakov, L. G., Leonenko, Z. V., Finot, E. & Cramb, D. T. | Interaction forces of a supported DOPC bilayer in the presence of the general anaesthetic halothane - An atomic force microscopy study | 2006 | Australian Journal Of Chemistry |
| Abstract: In this study atomic force microscopy (AFM) was used to study the effect of halothane on a supported dioleoylphosphatidylcholine ( DOPC) bilayer under conditions of high anaesthetic loading. In a previous study we demonstrated that bilayer restructuring occurs as a result of halothane incorporation. Force measurements using AFM indicate an initial decrease in adhesive forces and compressibility between the bilayer and AFM tip, followed by an increase in adhesion properties as a function of incubation time. This effect is attributed to the location and dynamic redistribution of halothane within the bilayer. | |||
BibTeX:
@article{Shamrakov2006,
author = {Shamrakov, L. G. and Leonenko, Z. V. and Finot, E. and Cramb, D. T.},
title = {Interaction forces of a supported DOPC bilayer in the presence of the general anaesthetic halothane - An atomic force microscopy study},
journal = {Australian Journal Of Chemistry},
year = {2006},
volume = {59},
number = {6},
pages = {386--389}
}
|
|||
| Skompska, M., Vorotyntsev, M. A., Refczynska, M., Goux, J., Lesniewska, E., Boni, G. & Moise, C. | Electrosynthesis and properties of poly(3,4-ethylenedioxythiophene) films functionalized with titanocene dichloride complex | 2006 | Electrochimica Acta |
| Abstract: Synthesis of a titanocene dichloride derivative functionalized with 3,4-etylenedioxythiophene group, Tc1EDOT (Cl2TiCpC5H4(CH2) (3,4-ethylenedioxythiophene)) has been described. Redox behavior of the monomer in tetrahydrofuran (THF), dichloromethane (DCM) and acetonitrile (AN) at different scan rates has been discussed in terms of different ability of these solvents to coordination with the reduced titanocene (Tc) complex and the solvation of Cl- anions. Electrooxidation of Tc1EDOT to get a conducting polymer film with immobilized titanocene dichloride centers and electrochemical properties of its polymer matrix in background acetonitrile solution have been compared with those of non-substituted PEDOT and PEDOT-methanol derivative (PEDOTMet), to elucidate the effect of substituents both on polymerization and redox potentials of the matrix. STM and AFM images of p(TclEDOT) films obtained with potentiodynamic and potentiostatic regimes are compared to illustrate that the films deposited at constant potential are better ordered and more compact than those obtained by cyclic voltammetry. A comparison of the cyclic voltammograms of p(Tc1EDOT) and poly(titinocene-propyl-pyrrole) (p(Tc3Py)) films in 0.1 TBAPF(6) in THF has shown that the electroactivity of the polymer matrix of p(TclEDOT) is extended to more negative potentials in comparison to that of p(Tc3Py). This results in the anodic shift of redox potential of Tc centers immobilized in p(Tc1EDOT) film with respect to that of the centers fixed in p(Tc3Py). (c) 2005 Elsevier Ltd. All rights reserved. | |||
BibTeX:
@article{Skompska2006,
author = {Skompska, M. and Vorotyntsev, M. A. and Refczynska, M. and Goux, J. and Lesniewska, E. and Boni, G. and Moise, C.},
title = {Electrosynthesis and properties of poly(3,4-ethylenedioxythiophene) films functionalized with titanocene dichloride complex},
journal = {Electrochimica Acta},
year = {2006},
volume = {51},
number = {11},
pages = {2108--2119}
}
|
|||
| Weeber, J. C., Baudrion, A. L., Bouhelier, A., Bruyant, A., Francs, G. C. D., Zia, R. & Dereux, A. | Efficient surface plasmon field confinement in one-dimensional crystal line-defect waveguides - art. no. 211109 | 2006 | Applied Physics Letters |
| Abstract: The authors operate a near-field optical microscope to investigate surface plasmon polariton (SPP) propagation along linear waveguides opened into one-dimensional (1D) plasmonic crystals, i.e., crystals featuring a single lattice plane orientation. They show that efficient SPP field confinement can be achieved by this type of waveguide although no band gap exists in the direction perpendicular to the waveguide axis. From computed wave-vector diagrams, they show that 1D plasmonic crystals can open a wide range of prohibited propagation directions preventing from a significant coupling of the waveguide SPP modes with the crystal Bloch modes. Finally, the authors demonstrate that the field distributions of the guided SPP modes can be qualitatively understood from simple Ewald constructions. (c) 2006 American Institute of Physics. | |||
BibTeX:
@article{Weeber2006,
author = {Weeber, J. C. and Baudrion, A. L. and Bouhelier, A. and Bruyant, A. and Francs, G. C. D. and Zia, R. and Dereux, A.},
title = {Efficient surface plasmon field confinement in one-dimensional crystal line-defect waveguides - art. no. 211109},
journal = {Applied Physics Letters},
year = {2006},
volume = {89},
number = {21},
pages = {11109--11109}
}
|
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