A new distributed-feedback technique is developed to dramatically improve the laser beam patterns and increase the output power levels of THz quantum cascade lasers (QCLs). The invention enables a new kind of THz semiconductor laser with enhanced performance and suitability for mass-production.
Primary Application Area: Electronics, Sensors, Communications
Technology Development Status: Proven Manufacturability
FIGURES OF MERIT
Value Proposition: The scientific principle of this innovation is that by ensuring the predesigned phase condition, the mode traveling inside the laser waveguide is coupled/phase-locked to the mode traveling outside on the top metal, hence establishing a standing-wave on top of the structure in addition to one existing inside the laser cavity. Due to the subwavelength vertical dimension in the cavity, a large amount of electric field couples to a surface-plasmon mode attached to the top metal cladding, where the electrical field is exponentially decaying in air. There are specially designed apertures in the metal-cladding, which act like individual components of a phased-array antenna transmitter, resulting to low divergence laser beam in two dimensions.
We experimentally demonstrated the narrowest and best beam pattern quality for Terahertz (THz) Quantum cascade lasers (QCLs) to-date.
Organization Type: Academic/Gov Lab
Showcase Booth #: 403
GOVT/EXTERNAL FUNDING SOURCES