Gaël Levêque

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A particular interesting plasmonic system is that of metallic nanostructures interacting with metal films. As the LSPR behavior of gold nanostructures (Au NPs) on the top of a gold thin film is exquisitely sensitive to the spacer distance of the film-Au NPs, we investigate in the present work the influence of a few-layered graphene spacer on the LSPR(More)
The performance of a new high-flux solar simulator consisting of 18 × 2.5 kWel radiation modules has been evaluated. Grayscale images of the radiative flux distribution at the focus are acquired for each module individually using a water-cooled Lambertian target plate and a CCD camera. Raw images are corrected for dark current, normalized by the exposure(More)
We have fabricated and tested an UV radiation detector by using a metal-oxide-semiconductor capacitor in the deep depletion mode with a semitransparent chromium electrode deposited on an oxidized silicon wafer. The quantum efficiency of the device is sensitive to the metal-layer thickness, since it absorbs part of the beam energy. Efficiency values of the(More)
2014 Normal and oblique incidence reflectances of GaTe have been measured in the 2.5 to 26 eV range using polarized synchrotron radiation. We have deduced 3 complex refractive indices, relative to 3 different crystallographic directions by means of a new method consistent with the Kramers-Kronig relations. We have verified that the electronic transitions in(More)
2014 We have studied the emission spectra of rare gases produced by a discharge light source. We report 70 new lines for the argon spectrum, related to highly ionized ions, mainly Ar IV to Ar VIII. The classification of these lines has not been possible here, but they are probably emitted by excited states of high potential energy. J. Physique 45 (1984)(More)
We present a method of determining optical constants n and k of a thin film using only the reflectance R(omega) curve (normal incidence reflectance spectroscopy). The method is based on the simultaneous use of Fresnel laws and dispersion relations between n and k of the film, via an iterative process. To illustrate the method, optical constants in the VUV(More)
The performance of a new high-flux solar simulator consisting of 18 × 2.5 kW<sub>el</sub> radiation modules has been evaluated. Grayscale images of the radiative flux distribution at the focus are acquired for each module individually using a water-cooled Lambertian target plate and a CCD camera. Raw images are corrected for dark current, normalized by the(More)
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