Patent ID: 7974324
Filing Date: 2011-07-05
Classification: B82Y,H01S

Abstract:
1. A surface-emitting laser device comprising: a substrate; a low refractive index layer with a refractive index n L and disposed on said substrate; a light emitting layered structure with a refractive index n H , where n H >n L , said light emitting layered structure being formed on said low refractive index layer and having first and second semiconductor layers and a multi-quantum well disposed between said first and second semiconductor layers and capable of generating photons having a wavelength λ 0 ; and a two-dimensional photonic crystal formed in said light emitting layered structure and having optical nanostructures arranged into a periodic pattern with a lattice constant a, said nanostructures extending from said first semiconductor layer through said multi-quantum well; wherein said two-dimensional photonic crystal has a normalized frequency, which is defined as a/λ 0 , ranging from 0.25 to 0.70; wherein said low refractive index layer is made from a III-V compound, silicon oxide, silicon nitride, or indium tin oxide, said light emitting layered structure being made from said III-V compound; wherein said optical nanostructures are in the form of circular nanocavities, which are arranged into a honeycomb-shaped pattern; wherein said light emitting layered structure is made from a GaN-based compound.