Concept

Liste de phénomènes optiques

Publications associées (87)

Stimulated polariton scattering in semiconductor microcavities: New physics and potential applications

Stimulated polariton scattering in semiconductor microcavities is reported. The phenomena arise from the bosonic character of the coupled exciton-photon modes of the system. The ability to manipulate and control the polariton dispersions in microcavities i ...

2001

Electromagnetic scattering of high-permittivity particles on a substrate

Olivier Martin

We contribute to the study of the optical properties of high-permittivity nanostructures deposited on surfaces. We present what we believe is anew computational technique derived from the coupled-dipole approximation (CDA), which can accommodate high-permi ...

Optical Society of America2001

Temperature dependence of optical properties of h-GaN films studied by reflectivity and ellipsometry

Nicolas Grandjean

Spectroscopic ellipsometry (SE) carried out at 300 K together with reflectivity measurements performed from 5 to 300 K are used to determine the temperature dependence of the refractive index of hexagonal GaN films between 360 and 600 nm. The refractive in ...

2000

Effects of built-in polarization field on the optical properties of AlGaN/GaN quantum wells

Nicolas Grandjean

AlGaN/GaN quantum well (QW) structures were grown entirely by molecular-beam epitaxy on c-plane sapphire substrates. Reflection high-energy electron diffraction intensity oscillations, which testify a smooth growth front surface at the molecular monolayer ...

1999

Polarization anisotropy and valence band mixing in semiconductor quantum wires

Elyahou Kapon, Marc-André Dupertuis, Daniel Oberli

We have studied the effect of valence band mixing on the optical properties of semiconductor quantum wires by analyzing the luminescence polarization. Large polarization anisotropy is observed and directly compared to the effects predicted by a k . p model ...

1997

Determination of the absorption and reduced scattering coefficients of human skin and bladder by spatial frequency domain reflectometry

Hubert van den Bergh, Georges Wagnières

A non-invasive method to measure the optical properties of a turbid medium such as biological tissue is described. To determine the absorption and reduced scattering coefficient, the sample is illuminated with spatially intensity modulated light and the ba ...

1997

A novel surveillance system for installed fiber optics cables using stimulated Brillouin interaction

Luc Thévenaz, Philippe Robert, Alexandre Fellay

A novel surveillance system for installed fiber optic cables is presented. It is based on the analysis of the local stimulated Brillouin scattering interaction. The configuration of the instrument rely on the use of a single laser source and the required l ...

1997

Three-dimensional optical phantom and its application in photodynamic therapy

Hubert van den Bergh, Georges Wagnières

BACKGROUND AND OBJECTIVE: A technique to manufacture a stable, reproducible three-dimensional optical phantom is presented. This phantom reproduces the tissue's optical properties as well as the geometry and, to some extent, the mechanical properties of th ...

1997

Photoluminescence and carrier dynamics in GaAs quantum wells

Vincenzo Savona, Paolo Schwendimann

We use a rate equation model in order to reproduce the dynamics of two-dimensional excitons and free carriers in a time resolved photoluminescence experiment. We investigate the dynamics of the exciton formation from free electron-hole pairs, and the evolu ...

1997

Cylindrical fiberoptic light diffuser for medical applications

Hubert van den Bergh

BACKGROUND AND OBJECTIVE: A cylindrical light diffuser has been developed mainly for medical applications, including photodynamic therapy (PDT), in particular interstitial PDT, PDT of the bronchi, or intravascular PDT. STUDY DESIGN/MATERIALS AND METHODS: T ...

1996

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