Optically functional device with integral resistance layer

Details Optically functional device with integral resistance layer Optically functional device with integral resistance layer

1992-02-12

1993-04-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502141, H01J 3150

Patent

active

052006050

ABSTRACT:
An optically functional device has a semiconductor substrate, a light receiving portion disposed on the semiconductor substrate for receiving input light, a light emitting portion disposed on the light receiving portion for emitting output light, a window disposed above the light emitting portion, through which input light and output light pass and a resistance layer made of a semiconductor for functioning as load resistance. The resistance layer is disposed at least in either place between the semiconductor substrate and the light receiving portion, or between the light receiving portion and the light emitting portion, or on the light emitting portion. The light emitting portion has a light emitting layer made of semiconductor material having an energy of forbidden band width of more than the energy of a main peak of input light. The light receiving portion has a base and a collector each of which is made of a semiconductor material having an energy of forbidden band width equal to or less than the energy of a main peak of input light. The light emitting portion is adapted to feed back a part of the output light to the light receiving portion. Thereby a nonlinear output response to input light is performed based on the feedback effect of the output light absorbed by the light receiving portion.

REFERENCES:
patent: 4782223 (1988-11-01), Suzuki
patent: 4952791 (1990-08-01), Hinton et al.

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