Demonstration of the Very Long Wavelength Infrared Type-II Superlattice InAs/InAsSb GaAs Immersed Photodetector Operating at Thermoelectric Cooling

In this letter, we report on the InAsilnAsSb type-II superlattice (T2SL) detector operating with 50% cut-off wavelength (lambda(c)) similar to 15 mu m for temperatures (T) reached by three-stage thermoelectric (TE) cooling to minimize the detector's volume to reach size, weight, and power (SWaP) conditions. The presented device reaches detectivity (D*) similar to 10(9) Jones (lambda(c) similar to 15 mu m). These results are the first reported on single pixel T2SL InAs/InAsSb photoconductor with lambda(c) similar to 15 mu m where GaAs immersion lens (IL) was implemented and integrated with three-stage Peltier TE cooler.