Concept

Optique cristalline

Publications associées (64)

Dielectric susceptibility of dipolar molecular liquids by ab initio molecular dynamics: application to liquid HCl

We study the dielectric susceptibility of liquid hydrogen chloride at a temperature of 313 K using ab initio molecular dynamics evolving, in a homogeneous electric field. For an evolution in absence of electric field, the calculated neutron structure facto ...

2004

Quantum kinetics of parametric polariton scattering in microcavities

Benoît Marie Joseph Deveaud, Stefan Kundermann, Cristiano Ciuti, Michele Saba

An investigation of the parametric amplification and its coherent control in a semiconductor micro-cavity is presented. The time and angle resolved pump and probe experiments show that several ps after pumping parametric scattering is still phase coherent. ...

2002

First-principles study of dynamical and dielectric properties of tetragonal zirconia

Alfredo Pasquarello

Using the variational density-functional perturbation theory, we investigate the dynamical and dielectric properties of tetragonal zirconia (t-ZrO2). We obtain the phonon frequencies at the center of the Brillouin zone, the Born effective charge tensors, a ...

2001

Separation of strain and quantum-confinement effects in the optical spectra of quantum wires

Elyahou Kapon, Marc-André Dupertuis

The photoluminescence (PL) and PL-excitation (PLE) spectra of InyCa1-yAs/AlxGa1-xAs compressively strained V-groove quantum wires (QWR's) are compared to that of lattice-matched GaAs/AlyGa1-xAs QWR's with the same wire geometry. The PL is preferentially po ...

2000

Does freezing in PbMg1/3Nb2/3O3 relaxor manifest itself in nonlinear dielectric susceptibility?

Alexander Tagantsev

A possible anomaly in the temperature dependence of nonlinear dielectric susceptibility chi(nl) of relaxor ferroelectrics related with the freezing phase transition was investigated. First, based on the phenomenological approach, the anomaly in the chi(nl) ...

1999

Nonlinear contributions to dielectric and piezoelectric properties in lead zirconate titanate thin films

Nava Setter, Dragan Damjanovic

The ac field dependence of dielectric and piezoelectric response of sol-gel derived Pb(Zr,Ti)O(3)thin films is presented. The nonlinear response of dielectric polarisation and piezoelectrically induced strain at sub-switching fields was studied in terms of ...

1999

Two-dimensional quantum-confined Stark effect in V-groove quantum wires: Excited state spectroscopy and theory

Elyahou Kapon, Alok Rudra, Marc-André Dupertuis, Klaus Leifer

We report on the electric field effects in photoluminescence (PL) and PL excitation (PLE) measurements of reverse-biased GaAs V-groove quantum wires. We observe large redshifts (9 meV at 265 kV/cm) of PL and PLE peaks as well as field dependent intensity a ...

1999

Characterization of phenanthrenequinone-doped poly(methyl methacrylate) for holographic memory

Demetri Psaltis

The holographic recording characteristics of phenanthrenequinone- (PQ-) doped poly(methyl methacrylate) are investigated. The exposure sensitivity is characterized for single-hologram recording, and the il M/# is measured for samples as thick as 3 mm. Opti ...

1998

Plasmon excitations in graphitic carbon spheres

Pierre Stadelmann

Electron energy loss spectroscopy in a high-resolution transmission electron microscope has recently been used with success to characterize the electronic properties of closed cage nanometer-size graphitic particles. In the plasmon region, the experimental ...

1998

Extension of the generalized multipole technique to anisotropic medias

Olivier Martin

This paper presents an extension of the generalized multipole technique (GMT) for 2D anisotropic scatterers. New expansions similar to the Bessel multipole expansion are derived for arbitrary anisotropic media. Numerical simulations prove the accuracy and ...

Elsevier1998

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