Infrared to visible image up-conversion using optically addressed spatial light modulator utilizing liquid crystal and InGaAs photodiodes

Combination of InGaAs/InP heterojunction photodetector with nematic liquid crystal (LC) as the electro-optic modulating material for optically addressed spatial light modulator for short wavelength infra-red (SWIR) to visible light image conversion was designed, fabricated, and tested. The photodete...

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Bibliographic Details
Published in:Applied physics letters 2016-01, Vol.108 (2)
Main Authors: Solodar, A., Arun Kumar, T., Sarusi, G., Abdulhalim, I.
Format: Article
Language:English
Subjects:
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Dark current
Goggles
HETEROJUNCTIONS
INDIUM PHOSPHIDES
Infrared imagery
LAYERS
Light
LIQUID CRYSTALS
Nematic crystals
Night vision
Night vision equipment
ORIENTATION
PHOTODIODES
Photoelectric effect
Photoelectric emission
Photometers
Photons
Spatial light modulators
SUBSTRATES
SURFACES
TEMPERATURE RANGE 0273-0400 K
Upconversion
VISIBLE RADIATION
WAVELENGTHS
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Summary:Combination of InGaAs/InP heterojunction photodetector with nematic liquid crystal (LC) as the electro-optic modulating material for optically addressed spatial light modulator for short wavelength infra-red (SWIR) to visible light image conversion was designed, fabricated, and tested. The photodetector layer is composed of 640 × 512 photodiodes array based on heterojunction InP/InGaAs having 15 μm pitch on InP substrate and with backside illumination architecture. The photodiodes exhibit extremely low, dark current at room temperature, with optimum photo-response in the SWIR region. The photocurrent generated in the heterojunction, due to the SWIR photons absorption, is drifted to the surface of the InP, thus modulating the electric field distribution which modifies the orientation of the LC molecules. This device can be attractive for SWIR to visible image upconversion, such as for uncooled night vision goggles under low ambient light conditions.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4939903