Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-06-22
1990-11-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 9615, 350 9617, H01J 516
Patent
active
049703862
ABSTRACT:
A high speed optical sensor comprising a parallel array of vertical field effect transistors and optical fibers disposed in the recesses between the transistors is disclosed herein. Each of the vertical field effect transistors includes a substrate of doped gallium arsenide divided by a depleted region. One side of each of the gallium arsenide substrates is flanked by an optical fiber which transmits an optical signal into one side of the depleted region, while the other side of the substrate includes a gate electrode for controlling the flow of photo charges induced in the depleted region by the light signals. The gate electrode serves not only to control the flow of charges through the transistor but also reflects back a portion of the light emanated by the optical fiber so that it passes a second time through the depleted region. The efficient light coupling that occurs between the optical fibers and the depleted regions of the substrates of the vertical FET's, in combination with the low capacitive leakage afforded by the design at high frequencies and the high power density obtainable with vertical FET's results in a photosensor which is advantageously efficient, fast the compact.
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Publication entitled "Fabrication Technology for Monolithic GaAs VFET" by R. C. Clarke et al., Westinghouse Electric Corp. Nov. 18, 1987.
Le Que Tan
Nelms David C.
Sutcliff W. G.
Westinghouse Electric Corp.
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