THz Superradiant Emitters Based on Quantum Dots in GaAs Driven at 1550 nm

In our Phase I effort, we discovered that an ErAs quantum-dot array in a GaAs matrix under 1550 nm pulsed excitation produces cooperative spontaneous emission—Dicke superradiance—in the terahertz frequency region at room temperature. The broadband average terahertz power output can reach the level greater than 100 uW. In this proposal, our goal is to extend the quasi-sinusoidal character of the superradiance toward a CW source. This will be a two-faceted effort starting with representative Maxwell-Bloch semi-classical model of superradiance, and its Sine-Gordon governing equation. The second facet will be growth and fabrication of new superradiant structures integrated with optical cavities, followed by experimental confirmation using time-domain and calibrated frequency-domain experiments.