Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1994-11-18
1996-01-30
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25037008, H01L 3106
Patent
active
054882265
ABSTRACT:
An thermal imaging device having a transparent substrate, an active multiple quantum well (MQW) epilayer with bottom electrical contacts bonded to the substrate, wherein the substrate is cut such that its thermal expansion coefficient is matched or roughly matched to that of the MQW epilayer in the direction parallel to the long axis of the bottom contacts and so that the thermal expansion coefficient of the substrate is mismatched in a direction normal to the long axis of the bottom contacts. Infrared radiation incident on each unit cell of the n.times.m array will produce a temperature change .DELTA.T in the MQW which will produce stress normal to the long axis of the bottom contacts. The uniaxial stress produced by the temperature changes .DELTA.T breaks the rotation symmetry in the plane of the MQW structure. This will result in anisotropic mixing of the heavy and light holes in the MQW epilayer and thus, will result in an anisotropic excitonic absorption of the MQW epilayer, which can be detected and analyzed either electrically or optically.
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Chen et al., "Two-Mode InGaSb/GaSb Strained-Layer Superlattice IR Photodetor" IEEE Electron Device Lett., vol. 14, No. 9, (Sep. 1993) pp. 447-449.
Shen et al., "Optical Anisotropy in GaAs/Al.sub.x Ga.sub.1-x Multiple Quantum Wells Under Thermally Induced Uniaxial Strain", Physical Reviews B, vol. 47, pp. 993-996, May 15, 1993.
Shen et al, "Normal Incidence High Contrast Multiple Quantum Well Light Modulator Based on Polarization Rotation", Applied Physical Letters, vol. 62, No. 23, pp. 2908-2910, Jun. 7, 1993.
Dutta Mitra
Iafrate Gerald J.
Shen Paul H.
Stroscio Michael A.
Anderson William H.
Hanig Richard
The United States of America as represented by the Secretary of
Willis Davis L.
Zelenka Michael
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