Thursday, August 10, 2017
US Patent-Quantum cascade external cavity laser with metasurfaces
United States Patent 9728930
Williams, Benjamin Stanford (Los Angeles, CA, US)
Xu, Luyao (Los Angeles, CA, US)
Chen, Daguan (Los Angeles, CA, US)
A metasurface reflector for quantum cascade lasing is disclosed. The metasurface reflector uses an array of subcavities disposed on a substrate and spaced with a sub-wavelength period. Each of the subcavities includes a layer of quantum-cascade-laser-active material sandwiched between two metallic layers. The array of subcavities reflect an incident light of a resonant frequency with amplification. When used with an output coupler, a quantum cascade laser beam can be generated.