Programmable multi-wavelength detector array
First Claim
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1. An integrated multi-wavelength photodetecting device, comprising:
- a semi-insulating compound semiconductor substrate, and more than one stack of photodetectors each sensitive to multi-ranges of optical wavelengths different from one another, laid laterally over and integrated on said semi-insulating compoud semiconductor substrate.
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Abstract
More than one photodetectors, each sensitive to different wavelengths, are integrated on a common semiconductor substrate. The different photodetectors can be stacked over one another or placed laterally on the common substrate. Gratings may be placed over each photodetector to sharpen the spectral response. Three such photodetectors can form a pixel of an active matrix array for an image sensor. The different photodetectors in each pixel can be multiplexed electronically. The electronic circuits for activating the different photodetectors can be integrated on the same substrate.
95 Citations
24 Claims
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1. An integrated multi-wavelength photodetecting device, comprising:
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a semi-insulating compound semiconductor substrate, and more than one stack of photodetectors each sensitive to multi-ranges of optical wavelengths different from one another, laid laterally over and integrated on said semi-insulating compoud semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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12. An integrated multi-wavelength photodetecting device, comprising:
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a semiconductor substrate;
more than one photodetectors each sensitive to a range of optical wavelength different from one another, and integrated on said semiconductor substrate, wherein one of said photodetectors has successive layers of AlInAs, GaInAs, AlGaInAs, InAlAs and GaInAs grown over said substrate and sensitive to wavelength of 8 μ
m to 10μ
m.
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Specification