Characterisation of 2D photonic crystals cavities on InP membranes

We report on characterisation of optical modes in InP microcavities formed by two-dimensional (2D) photonic crystals (PC) on a suspended membrane. Diffracted photoluminescence (PL) experiments and numerical calculations are associated in order to analyse the properties of PC microresonators and waveguides and to investigate the coupling between these two building blocks of PC based photonic integrated circuits

Studies of the photonic and optical-frequency phonon properties of selectively grown GaN micro-pyramids

An array of GaN micropyramids containing a near-surface InxGa1-xN/GaN single quantum well has been fabricated using selective area epitaxial overgrowth above a patterned silica mask. The pyramid array has been studied by means of angle-resolved reflection measurements using s- and p-polarized incident light in the near- and mid-infrared optical ranges. We have found that the periodic array of flat-topped pyramids shows marked resonances in the near-infrared optical range due to resonant Bloch modes within the extraction cone and that the angular dispersion of these modes exhibits strong photonic crystal characteristics. The experimental results are in good agreement with the photonic band structure calculated using a scattering matrix formalism. The mid-infrared optical anisotropy properties of the micropyramids were investigated to probe the infrared active phonons of the pyramid array. The A1(LO) phonon of the InxGa1-xN/GaN single quantum well was identified and the InN mole fraction was estimated from the mode behavio

Propagation dans les guides d'ondes à cristaux photoniques et couplage guide-cavité

Nous étudions les capacités de structures à base de cristaux photoniques bi-dimensionnels à régir le comportement de la lumière à l'échelle de la longueur d'onde. Plus spécifiquement nous caractérisons les propriétés modales (vitesse de groupe, pertes...) de guides obtenus en créant un défaut linéique dans la structure périodique. Nous démontrons de plus le couplage entre de tels guides et une cavité réalisée elle aussi dans le cristal photonique

Angular dispersion of photons and phonons in a photonic crystal of selectively grown GaN pyramids containing an InxGa1-xN quantum well structures

Angular-dependent reflection measurements were used to map out the dispersion relations of the resonant Bloch modes, and the angular dispersion of the phonon modes, in a photonic crystal consisting of selectively grown GaN pyramids containing a single InxGa1-xN/GaN quantum well. The dispersion of the photons exhibits strong photonic crystal characteristics, while the mean indium content of the 2 nm thickness InxGa1-xN layer was extracted from the angular dispersion of the phonon modes

Giant second-harmonic generation in a one-dimensional GaN photonic crystal

International audienc

Giant second-harmonic generation in a one-dimensional GaN photonic crystal

International audienc

Microlasers à cristaux photoniques en InP reporté sur silicium

Nous avons réalisé des microcavités à cristaux photoniques à 2D sur une hétérostructure en InP reportée sur silicium. Les propriétés modales de ces structures ont été étudiées théoriquement et expérimentalement, en fonction de la taille de la cavité et du diamètre des trous du cristal photonique. Un pompage de ces structures en régime pulsé à température ambiante a permis d'atteindre une mission laser pour un seuil effectif de l'ordre de 2 MW