17 research outputs found
High strength materials: in situ investigations of dislocations behaviour in Cu/Nb multifilamentary nanostructured composites
No full textEquifrequency surfaces in a two-dimensional GaN-based photonic crystal
No full textInternational audienc
Polarization effects in second-harmonic generation in GaN-based one-dimensional photonic crystal
No full textExperimental dispersion of the radiative Bloch modes of GaAs photonic crystals consisting of pillars in a graphite arrangement
No full textEnhancement of second harmonic generation in one-dimensional and two-dimensional epotaxial GaN-based photonic crystals
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Equifrequency surfaces in GaN/sapphire photonic crystals
No full textInternational audiencePhotonic crystals are a new class of materials where photonic band gaps, large dispersion and anisotropy occur. By exploiting these properties GaN photonic crystals should have important potential for optoelectronic applications, principally in the areas of high-efficiency light emitters and second-harmonic generators. We present measurements of the equifrequency surfaces of the radiative Bloch modes for a photonic crystal etched in a GaN/sapphire film. The photonic band structure is calculated by using a scattering matrix method that reproduces well the anisotropy of the equifrequency surfaces exhibited by the photonic crystal. (C) 2002 Elsevier Science B.V. All rights reserved
Giant second-harmonic generation in a one-dimensional GaN photonic crystal
No full textInternational audienc
