Concept

Polarisabilité

Publications associées (66)

Holographic second harmonic generation (SHG) microscopy

Christian Depeursinge, Pierre Marquet, Etienne Shaffer

The coherent nature of second harmonic generation (SHG) makes possible retrieval of both its amplitude and its phase, by use of a proper phase-sensitive imaging technique such as digital holographic SHG microscopy. In addition to retrieving both amplitude ...

2011

Electrokinetic control of sample splitting at a channel bifurcation using isotachophoresis

Alexandre Louis André Persat

We present a novel method for accurately splitting ionic samples at microchannel bifurcations. We leverage isotachophoresis (ITP) to focus and transport sample through a one-inlet, two-outlet microchannel bifurcation. We actively control the proportion of ...

2009

Self-consistent ICRF simulations in fully shaped anisotropic plasmas

Jonathan Graves, Wilfred Anthony Cooper, Stephan Brunner, Martin Jucker, Nicolas Mellet

For self-consistent ICRF heating simulations, four codes have been coupled: VMEC[1] provides a fully shaped, anisotropic 3D MHD equilibrium (bi- Maxwellian distribution function), transferred to Boozer coordinates by TERPSICHORE[2]. The full-wave code LEMa ...

2009

Uniaxial strain in graphene by Raman spectroscopy: G peak splitting, Gruneisen parameters, and sample orientation

Nicola Marzari

We uncover the constitutive relation of graphene and probe the physics of its optical phonons by studying its Raman spectrum as a function of uniaxial strain. We find that the doubly degenerate E(2g) optical mode splits in two components: one polarized alo ...

2009

Infrared investigation of the phonon spectrum in the frustrated spin cluster compound FeTe2O5Cl

László Forró, Helmuth Berger

We present our optical investigations on the frustrated spin cluster compound FeTe2O5Cl, which develops a long-range antiferromagnetic order below 10 K. We measure the optical reflectivity from the far-infrared to the ultraviolet with polarized light. We f ...

2009

Polarization field mapping of AlInN/AlN/GaN heterostructure

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek, Anas Mouti

Off-axis electron holography has been used to measure the built-in potential profile across an Al0.85In0.15N/AlN/GaN high electron mobility transistor heterostructure. Profile measurements indicated a polarization-induced electric field of 6.9 MV/cm within ...

2009

Polarization field mapping of Al0.85In0.15N/AlN/GaN heterostructure

Nicolas Grandjean, Jean-François Carlin, Eric Feltin, Marcus Gonschorek, Anas Mouti

2009

Monte Carlo ICRH simulations in fully shaped anisotropic plasmas

Jonathan Graves, Wilfred Anthony Cooper, Stephan Brunner, Martin Jucker, Nicolas Mellet

This work shows a self-consistent numerical model of ion cyclotron resonant heating (ICRH) in a plasma of arbitrary (2D or 3D) geometry. Effects of anisotropy and full shaping on both MHD equilibrium and the dielectric tensor are explored. In particular, i ...

2008

Micro-optical polarizer with high efficiency

Hans Peter Herzig, Toralf Scharf

Based on liquid crystal polymers (LCP) a compact micro-optical polarizer with high efficiency has been designed and realized. By using cylindrical mierolens arrays made of LCP and index matching layer, a complete separation of both polarization components ...

2008

Long-range radiative interaction between semiconductor quantum dots

Vincenzo Savona, Gaetano Parascandolo

We model the resonant excitation transfer between semiconductor quantum dots, accounting for the radiative nature of the electromagnetic field. The model based on Maxwell equations and on a non-local, and for linear susceptibility accounts both for the ins ...

2007

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