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Owing to the nonlinear effect of optical field-induced director reorientation, self-focusing of an optical beam can occur in nematic liquid crystals and an almost diffraction-compensated propagation can be observed with milliwatts of light power and propagation lengths of several millimeters. This opens the way for applications in all-optical signal… (More)
—We demonstrate a very compact multifunctional pho-tonic-crystal demultiplexer on high index contrast InP-membrane for coarse WDM applications. Polarization diversity is implemented using 2D-grating couplers. The performance of the device is evaluated using integrated p-in photodetectors. Polarization diversity from fiber to detector—without intermediate… (More)
Using phase-measurement interferometry we observe the self-induced waveguide of a nematicon. The measured high nonlocality of the reorientational nonlinearity of our nematic liquid crystal agrees with our (2+1)-D numerical simulation.
We show experimentally that the two-component multimode spatial optical vector soliton, i.e., a two-hump self-guided laser beam, exhibits in Kerr media a sharp space-inversion symmetry-breaking instability. The experiment is performed in a CS2 planar waveguide using the orthogonal circular polarization states of light as the two components of the vector… (More)
We demonstrate the integration of a 30% efficient grating coupler with a compact photonic crystal wavelength demultiplexer (DeMUX). The DeMUX has seven output channels that are spaced 10 nm apart and is aimed at coarse WDM applications. The integrated devices are realized on a high-index-contrast InP membrane using a simple benzocyclobutene wafer bonding… (More)
We report the experimental observation of the elliptically polarized fundamental vector soliton of isotropic Kerr media and its unique polarization evolution. This was achieved in the spatial domain in a nonbirefringent CS2 planar waveguide.
Quasi-periodic arrays of bright soliton-like beams are obtained experimentally in the picosecond regime as a result of the transverse modulational instability of a noisy continuous background in a planar CS2 waveguide. For a given propagation length, the array is stable from a laser shot to another and for a wide range of input intensities. The experimental… (More)
Spatial optical solitons in nematic liquid crystals are called nematicons . They occur due to the nonlinear self-focusing of an optical beam, injected laterally into a liquid crystal cell. The origin of the self-focusing can either be thermal or reorientational. In the latter case, the molecules are reoriented by the electric field of the light, which in… (More)
RESUME Nous présentons quelques résultats théoriques et expérimentaux préliminaires sur la propagation de faisceaux solitons dans un cristal liquide en phase nématique planaire. La variation non linéaire de l'indice de réfraction est causée par la réorientation photoinduite, non locale et non instantanée, des molécules constituant le cristal. Elle autorise… (More)