Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-01-17
1990-02-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250213A, 377102, H01J 4014
Patent
active
049048597
ABSTRACT:
Lower switching energies, enhanced electroabsorption and reduced tolerances on the operating wavelength of incident light are achieved while contrast between low and high absorption states is maintained in accordance with the principles of the invention by a self electrooptic device including an intrinsic quantum well region having an asymmetric electronic characteristic across a narrow bandgap subregion between the two wide bandgap layers defining the quantum well region. As a result, the quantum well region polarizes electrons and holes within the subregion in an opposite direction relative to a direction for an electric field applied to the device. The asymmetric electronic characteristic is realized as a compositionally graded, narrow bandgap layer or as a pair of coupled narrow bandgap layers of differing thicknesses separated by a thin wide bandgap layer.
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Goossen Keith W.
Miller David A. B.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Hsia Sherrie
Nelms David C.
Ranieri Gregory C.
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