The optical crosstalk of MCT infrared focal plane arrays is studied in a systematic way. Considering detectors different structure and material parameters, including the external optical structure, temperature, pixel size, epitaxial thickness, minority carrier lifetime, and absorption coefficient, the amplitude of optical crosstalk are calculated. Results show that the thickness of substrates epitaxial layer in the internal structure and the vacuum layer in the external optical structure are the major influencing factors for the amplitude of optical crosstalk.
