Abstract

N-color (Hg,Cd)Te photodetectors capable of spectral band analysis have been fabricated, tested, and delivered. This paper discusses the state of the art in (Hg,Cd)Te n-color photoconductive detectors. Included is a discussion of narrow band two-color devices responsive in the region of 8–14 μ. D*λp, 10 kHz, 1) higher than 3.5×109cmHz12/W have been achieved in both top and bottom elements at 95 K. The top element exhibited a cutoff wavelength of 8.8 μ, while the bottom element was responsive from 9.6 μ to 11.1 μ. The device was assembled with a long-wavelength pass filter that yielded two narrow bands. Preliminary results are also included for a unique three-color (Hg,Cd)Te device with cutoff wavelengths of 9.1 μ, 10.8 μ, and 13.8 μ.

© 1972 Optical Society of America

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