Patent ID: 9635284
Date: 2017-04-25
CPC Classifications: G01J,G01N,H01L,H04N

Claim:
1. A device comprising: a focal plane array comprising a plurality of infrared photo detectors, wherein each infrared photo detector comprises: a plurality of quantum well layers configured to generate a desired photocurrent in response to infrared radiation; and a plurality of barrier layers alternating with the quantum well layers, wherein an amount of doping of the quantum well layers, a spacing of quantum wells in the quantum well layers, and thicknesses of the quantum well layers and the barrier layers are selected to tune the focal plane array to have a limited spectral bandwidth with a peak response within a wavelength range of 10.3 μm to 10.8 μm and a full width half maximum spectral bandwidth of less than 0.7 μm in response to the infrared radiation, and wherein the less than 0.7 μm spectral bandwidth of the focal plane array is selected to reduce signal noise substantially outside the wavelength range of 10.3 μm to 10.8 μm associated with operation of the focal plane array and/or an optical band pass filter.