Demonstration of a 320x256 two-color focal plane array using InAs/InGaAs quantum dots in well detectors

We report the demonstration of a two-color infrared focal plane array based on a voltage-tunable quantum dots-in-well (DWELL) design. The active region consists of multiple layers of InAs quantum dots in an In0.15Ga0.85As quantum well. Spectral response measurements yielded a peak at 5.5 mu m for lower biases and at 8-10 mu m for higher biases. Using calibrated blackbody measurements, the midwavelength and long wavelength specific detectivity (D*) were estimated to be 7.1 x 10(10) cm Hz(1/2)/ W(V-b= 1.0 V) and 2.6 x 10(10) cm Hz(1/2)/ WsVb= 2.6 V) at 78 K, respectively. This material was processed into a 320 x 256 array and integrated with an Indigo 9705 readout chip and thermal imaging was achieved at 80 K. (c) 2005 American Institute of Physics.