Infrared detectors
US5248884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1984 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Sep 20, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0837
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An infrared detector comprises a thin film of photo-responsive material on transparent dielectric material with an array of planar antennae adjacent to the film surface. The antennae are separate from ohmic contacts arranged to connect the film to an external circuit. The antennae concentrate radiation in fringe fields at antenna edges and extremities interacting with the photo-responsive material. The detectors may be photovoltaic or photoconductive. The antennae may be rectangular, bow-tie, cruciform, elliptic, circular or square, and are dimensioned for resonance (preferably half-wavelength resonance) at frequencies within the photo-responsive material absorption band. Half-wavelength resonant antennae are best matched by F/0.7 optics. The detector may be a reticulated array. The dielectric material may be formed as a lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.