G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/01 (2006.01) G02F 1/015 (2006.01) G02F 1/315 (2006.01) G02F 1/35 (2006.01) H01L 31/0264 (2006.01) H01L 31/0272 (2006.01) H01L 31/0352 (2006.01) H01L 31/06 (2006.01)
Patent
CA 2140451
The present invention relates to novel optical devices operating in the infrared, based on indirect nar- row-gap superlattices (INGS) as the active optical materials. The novel optical devices include (1) wideband all-optical switches, which combine small insertion loss at low light in- tensities with efficient optical switch- ing and optical limiting at high effi- ciency and low tunneling noise cur- rents, suitable for use in longwave in- frared focal plane arrays. INGS comprise multiple semimetal (22) semiconductor (26) layers having compatible crystal symmetry across each heterojunction between a given semimetal (22) sandwiched between semiconductor layers (26). Each semiconductor layer (26) is thin enough that there is coupling be- tween adjacent semiconductor layers (26). The present invention utilizes INGS, which are fabricated to meet the criteria Eindg < ?.omega. < Edirg, especially where ?.omega. < 100 meV, as the optical material for optical switches. The present inven- tion also utilizes INGS as optical detectors if they are fabricated such that Eindg < Edirg < ?.omega., especially where ?.omega. is less than 100 meV.
Bartoli Filbert Joseph
Golding Terry D.
Hoffman Craig Anthony
Meyer Jerry R.
Miller John H. Jr.
Government Of The United States Represented By The Secretary Of The Navy
Swabey Ogilvy Renault
University Of Houston
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