P. Billaud
University of Lyon
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Publication
Featured researches published by P. Billaud.
Nano Letters | 2009
H. Baida; P. Billaud; Salem Marhaba; D. Christofilos; E. Cottancin; A. Crut; J. Lermé; P. Maioli; M. Pellarin; M. Broyer; N. Del Fatti; F. Vallée; Ana Sánchez-Iglesias; Isabel Pastoriza-Santos; Luis M. Liz-Marzán
The optical extinction spectra of single silver nanoparticles coated with a silica shell were investigated in the size range 10-50 nm. Measurements were performed using the spatial modulation spectroscopy technique which permits independent determination of both the size of the metal nanoparticle under study and the width of its localized surface plasmon resonance (LSPR). These parameters can thus be directly correlated at a single particle level for the first time. The results show a linear increase of the width of the LSPR with the inverse diameter in the small size regime (less than 25 nm). For these nanoparticles of well-controlled environment, this can be ascribed to quantum confinement of electrons or, classically, to increase of the electron surface scattering processes. The impact of this effect was measured quantitatively and compared to the predictions by theoretical models.
Applied Physics Letters | 2006
O. Muskens; N. Del Fatti; Fabrice Vallée; J. R. Huntzinger; P. Billaud; M. Broyer
Optical absorption spectra of small single metal nanoparticles are measured using a far-field technique combining a spatial modulation microscope with a broadband light source. Quantitative determination of the spectral and polarization dependencies of the absorption cross section of individual gold nanoparticles permits precise determination of their geometrical properties in excellent agreement with transmission electron microscopy measurements.
Review of Scientific Instruments | 2010
P. Billaud; Salem Marhaba; Nadia Grillet; E. Cottancin; Christophe Bonnet; J. Lermé; J. L. Vialle; M. Broyer; M. Pellarin
This article describes a high sensitivity spectrophotometer designed to detect the overall extinction of light by a single nanoparticle (NP) in the 10(-4)-10(-5) relative range, using a transmission measurement configuration. We focus here on the simple and low cost scheme where a white lamp is used as a light source, permitting easy and broadband extinction measurements (300-900 nm). Using a microscope, in a confocal geometry, an increased sensitivity is reached thanks to a modulation of the NP position under the light spot combined with lock-in detection. Moreover, it is shown that this technique gives access to the absolute extinction cross-sections of the single NP provided that the incident electromagnetic field distribution experienced by the NP is accurately characterized. In this respect, an experimental procedure to characterize the light spot profile in the focal plane, using a reference NP as a probe, is also laid out. The validity of this approach is discussed and confirmed by comparing experimental intensity distributions to theoretical calculations taking into account the vector character of the tightly focused beam. The calibration procedure permitting to obtain the absolute extinction cross-section of the probed NP is then fully described. Finally, the force of the present technique is illustrated through selected examples concerning spherical and slightly elongated gold and silver NPs. Absolute extinction measurements are found to be in good consistency with the NP size and shape independently obtained from transmission electron microscopy, showing that spatial modulation spectroscopy is a powerful tool to get an optical fingerprint of the NP.
Journal of The Optical Society of America A-optics Image Science and Vision | 2008
J. Lermé; Guillaume Bachelier; P. Billaud; Christophe Bonnet; M. Broyer; E. Cottancin; Salem Marhaba; M. Pellarin
We develop a new and numerically efficient formalism to describe the general problem of the scattering and absorption of light by a spherical metal or dielectric particle illuminated by a tightly focused beam. The theory is based on (i) the generalized Mie theory equations, (ii) the plane-wave decomposition of the converging light beam, and (iii) the expansion of a plane wave in terms of vector spherical harmonics. The predictions of the model are illustrated in the case of silver nanoparticles. The results are compared with the Mie theory in the local approximation. Finally, some effects related to the convergence of the beam are analyzed in the context of experiments based on the spatial modulation spectroscopy technique.
Physical Review Letters | 2004
Arnaud Arbouet; D. Christofilos; N. Del Fatti; Fabrice Vallée; J. R. Huntzinger; L. Arnaud; P. Billaud; M. Broyer
Journal of Physical Chemistry C | 2008
P. Billaud; Salem Marhaba; E. Cottancin; L. Arnaud; Guillaume Bachelier; Christophe Bonnet; N. Del Fatti; J. Lermé; F. Vallée; J. L. Vialle; M. Broyer; M. Pellarin
Physical Review B | 2008
O. L. Muskens; P. Billaud; M. Broyer; N. Del Fatti; Fabrice Vallée
European Physical Journal D | 2007
P. Billaud; J. R. Huntzinger; E. Cottancin; J. Lermé; M. Pellarin; L. Arnaud; M. Broyer; N. Del Fatti; Fabrice Vallée
Archive | 2010
Yejun Feng; R. Jaramillo; Jiyang Wang; Y. Ren; T. F. Rosenbaum; P. Billaud; Salem Marhaba; Nadia Grillet; Emmanuel Cottancin; Christophe Bonnet; Jean Lermé; J. L. Vialle; M. Broyer; M. Pellarin
Journal De Physique Iv | 2006
N. Del Fatti; O. Muskens; Fabrice Vallée; J. R. Huntzinger; P. Billaud; M. Broyer