Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-07-31
1994-05-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
257 17, 257 21, H01L 2712
Patent
active
053110099
ABSTRACT:
In accordance with the invention, a quantum well device provides localized states for electrons having an energy E greater than the barrier height of the constituent quantum wells. The device comprises a confinement quantum well of width L.sub.w equal to an integer number n of deBroglie half wavelengths ##EQU1## and a plurality of adjacent quarter wavelength barriers and wells, each having a thickness equal to an odd number m of deBroglie quarter wavelengths. Constructive interference between the waves partially reflected by the interfaces between adjacent .lambda./4 barriers and .lambda./4 wells leads to the formation of a localized electron state at an energy E in the region of the confinement well. The device can be used in detectors and modulators employing transitions between a bound state within the well and the localized state above the well.
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Capasso Federico
Cho Alfred Y.
Faist Jerome
Sirtori Carlo
Sivco Deborah L.
AT&T Bell Laboratories
Books Glen E.
Lee John R.
Nelms David C.
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