Patent ID: 8755414

Claim:
A laser device having a wave emission within a frequency range of 0.5 to 5 THz, the device comprising: a semiconductor heterostructure arranged over a surface of a substrate, said surface forming a first side of the substrate, said heterostructure having a cylindrical form with a circular cross-section, and comprising a first optically nonlinear semiconductor material layer including an emitting-medium configured to emit at least two optical whispering gallery modes belonging to the near-infrared spectrum, the two whispering gallery modes being confined within the first layer and enabling the generation, within the first layer, of radiation within an electromagnetic whispering gallery mode having a frequency of 0.5 to 5 THz, the radiation being obtained through the difference in frequency of the two whispering gallery modes, the cylindrical geometry of said heterostructure ensuring phase tuning between the two optical whispering gallery modes belonging to the near-infrared spectrum and the terahertz mode at the difference in frequency; a second and a third semiconductor material layer, each having an optical index weaker than the index of the material used for the first layer and located on both sides of the first layer; a first metal layer arranged at a first end of the heterostructure, and a second metal layer arranged at a second end, opposite said first end, of the heterostructure and between said surface of the substrate and said first metal layer, the first and second metal layers arranged to confine said terahertz mode; a first electrical contact provided on said first metal layer for injection of a pumping current of said emitting medium, and a second electrical contact provided on a second side, opposite said first side, of the substrate.