Method of coupling radiation in an infrared detector, and an arr

Details Method of coupling radiation in an infrared detector, and an arr Method of coupling radiation in an infrared detector, and an arr

1992-03-27

1993-07-20

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

2503384, H01L 2714

Patent

active

052296148

ABSTRACT:
A method for coupling radiation in an infrared detector of the kind which uses quantum wells that are comprised of thin layers of, e.g., gallium arsenide (GaAs) surrounded by aluminum gallium arsenide (AlGaAs). The invention is characterized in that a two-dimensional crossed grating (6), a so-called 2-D grating, is constructed on the top of the detector mesa of the detector on the side opposite the surface through which incident light (5) enters the detector. The grating (6) is caused to spread the incident light in different directions. According to one preferred embodiment, the detector also includes a cladding layer (14) which, together with the crossed grating, forms a wave guide.

REFERENCES:
patent: 3444381 (1969-05-01), Wendland
patent: 3487223 (1969-12-01), St. John
patent: 5026148 (1991-06-01), Wen et al.
patent: 5075749 (1991-12-01), Chi et al.

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