INFRARED DETECTOR USING A RESONANT OPTICAL CAVITY FOR ENHANCED ABSORPTION
Assignee
MASSACHUSETTS INSTITUTE OF TECHNOLOGY A MA CORP
Filed
Aug 13, 1985
Granted
Oct 3, 1995
Location
Cambridge MA (Draper Lab/MIT)
Abstract
A photodetector for detecting optical irradiation at a predetermined wavelength is provided with an integral, resonant optical cavity by forming a plurality of layers of material on a metallic reflector backing, the total optical thickness of those layers being an odd multiple of one-quarter of the predetermined wavelength. One of those layers is an active (i.e. optically-absorptive) semiconductor material. When the materials are deposited, that absorbing layer is formed at a level in the cavity including a region of peak optical field. As a result of the enhanced absorption provided by the resonant structure, the active layer may be very thin (i.e., less than one-tenth of a wavelength thick), yielding many beneficial results.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jun 15, 1987
Rescinded
Feb 17, 1995
Duration
7 years, 8 months
Inventor
- 1DAVID L. SPEARS
Sensitive facility: Cambridge MA (Draper Lab/MIT)
Record Details
- Patent number
- US 5455421
- Application
- 06765316
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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