Patent ID: RE38682

Claim:
A resonant vertical cavity optoelectronic semiconductor device, comprising: an epitaxially grown distributed bragg reflector bottom mirror; a first layer of N+ type GaAs deposited on said epitaxial mirror; a layer of N+ type aluminum gallim arsenide disposed on said layer of GaAs; a layer of P type aluminum gallim arsenide disposed on said layer of N+ type aluminum gallim arsenide; a PHEMT (Pseudomorphic High Electron Mobility Transistor) epitaxial layer structure without a schottky contact and using N+ type modulating doping, disposed on said layer of P type aluminum gallium arsenide said PHEMT comprising a layer of aluminum gallium arsenide (˜15% Al), a layer of GaAs, one to three quantum wells of strained InGaAs separated by GaAs barriers, a spacer layer of aluminum gallium arsenide (˜15% Al), an N+ modulation doped layer of aluminum gallium arsenide (˜15% Al) and a gate spacer layer of aluminum gallium arsenide (˜15% Al); a very thin (˜80 Å) layer of P+ type heavily doped aluminum gallium arsenide (˜15% Al) as a planar doped layer and then a cladding layer of aluminum gallium arsenide (40%-70%) of modest P type doping (˜10 17 cm −3 ) disposed on said planar doped layer; an ohmic contact layer of P++ type doping deposited on said cladding layer; a first layer of a top dielectric mirror deposited on said contact layer to a thickness of approximately ¼ wavelength of a specific designed frequency and etched to a controlled thickness to form an optical grating with a second order pitch for diffraction through approximately 90°, the angle of the teeth of said diffraction grating being chosen to optimize the diffraction in a specific desired output direction and to minimize the diffraction in the opposite direction and the depth of the teeth being chosen to maximize the diffraction efficiency; additional layer of said top dielectric mirror deposited on said first layer of said top dielectric mirror to form a complete structure of said Distributed Bragg Reflector (DBR) mirror with very high reflectivity for a vertically resonant wave such that the diffracted energy of the grating is substantially greater than the energy transmitted through the mirror.