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Infrared Electroreflectance Modulator

IP.com Disclosure Number: IPCOM000093351D
Original Publication Date: 1967-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Axe, JD: AUTHOR [+2]

Abstract

Modulation of infrared light by varying the reflectance of a semiconductor electrode is provided. Semiconductor material 2, such as N-type germanium or N-type gallium arsenide, is inserted into cell 3 containing an electrolytic solution 4 of H(2)O or methanol and serves as an electrode. Silicon window 5 is Inserted in the wall of cell 3 so that it is highly transmissive of infrared. Platinum electrode 6 is inserted in electrolyte 4 and an externally applied voltage source is placed between electrodes 2 and 6.

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Infrared Electroreflectance Modulator

Modulation of infrared light by varying the reflectance of a semiconductor electrode is provided. Semiconductor material 2, such as N-type germanium or N-type gallium arsenide, is inserted into cell 3 containing an electrolytic solution 4 of H(2)O or methanol and serves as an electrode. Silicon window 5 is Inserted in the wall of cell 3 so that it is highly transmissive of infrared. Platinum electrode 6 is inserted in electrolyte 4 and an externally applied voltage source is placed between electrodes 2 and 6.

Alternating voltages from source 7 applied to the electrodes alter the reflectivity of semiconductor 2 to any incident infrared light. If the AC source has a frequency of n cycles/sec, the incident Infrared is reflected by the semiconductor electrode and is modulated at a frequency of n cycles per second.

Alternate methods of obtaining modulation involve replacing the semiconductor-electrolyte junction shown with a planar PN junction or a metal- oxide-semiconductor structure. The electroreflectance modulator shown is very effective in the infrared spectral range where conventional transmission type modulators are not practical. It is also compact and requires low voltages and low power to operate.

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