Superlattice Tunneling Detectors Operating at Lambda=10microns, based on Quantum Well Intersubband Absorption
01 January 1987
We demonstrate a novel 10.8microns superlattice infrared detector based on doped quantum wells of GaAs/AlGaAs. Intersubband resonance radiation excites an electron from the ground state into the first excited state, where it rapidly tunnels out producing a photocurrent. We achieve a narrow bandwidth (10%) photosensitivity with a responsivity of 0.52 A/W and an estimated speed of 45 psec.