Split-ring infrared detector

Details Split-ring infrared detector Split-ring infrared detector

1990-12-24

1996-09-24

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25037001, 250214R, G01J 528

Patent

active

055593313

ABSTRACT:
A resonant, photoconductive detector for infrared radiation in which a reduced-volume pattern of the photoconductor permits impedance-matching to free space. The photoconductor pattern is a split-ring pattern, typically made of HgCdTe, which is virtually cylindrically symmetric, yielding a non-polarization-sensitive response. The region below the patterned photoconductor is a quarter-wavelength resonant cavity type structure. The ohmic contacts are conductively distanced from one another by use of the split-ring pattern. Spacing dimensions are slightly less than a wavelength for the infrared wavelengths to be absorbed; but ring-width dimensions of the photoconductor are substantially less to effect the volume reduction and the corresponding detectivity and radiation-hardness improvements. The essentially cylindrical isotropic pattern eases fabrication by averaging etching nonuniformities.

REFERENCES:
patent: 4366377 (1982-12-01), Notthoff et al.
patent: 4542295 (1985-09-01), Mattson et al.
patent: 4882478 (1989-11-01), Hayashi et al.

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