Size restrictions of radiation detecting with semiconductor photodetectors

Evgenij A. Salkov; George S. Svechnikov; Nikolai M. Krolevets

doi:10.1117/12.252077

25 September 1996 Size restrictions of radiation detecting with semiconductor photodetectors

Evgenij A. Salkov, George S. Svechnikov, Nikolai M. Krolevets

Proceedings Volume 2894, Detectors, Focal Plane Arrays, and Applications; (1996) https://doi.org/10.1117/12.252077
Event: Photonics China '96, 1996, Beijing, China

Abstract

The article presents an analysis of problems which arise in thermal radiation detection by means of a photodetector when the photodetector and/or light source is of small size. Practical expediency of the analysis is linked with the problem of adequate identification of small objects which are observable within the spectral region of thermal radiation and, on the other hand, with lossless transmission and processing of optical information. Consequently, it is necessary to take into account the physical peculiarities of both detector and emitter to determine the real capabilities of the transmitting-detecting processes. Quantum limitations which stem from uncertainty relations (impulse-coordinate, energy-time and phase-photon number) and classic restrictions of mode number of thermal radiation within the cavity of a small fixed volume have been examined. Corrections are introduced in expressions for both the detectivity spectral dependence and noise equivalent temperature. These correspond to size-corrections to the spectral distribution of `small-blackbody' radiation. It is also shown that a light source of a small size drastically influences the time which is required to detect this light source, or an object which consists of small-size particles (porous, cloud-like objects etc.). The spectral `quality' of blackbody emission is discussed briefly in connection with heterodyne detection.

Citation Download Citation

Evgenij A. Salkov, George S. Svechnikov, and Nikolai M. Krolevets "Size restrictions of radiation detecting with semiconductor photodetectors", Proc. SPIE 2894, Detectors, Focal Plane Arrays, and Applications, (25 September 1996); https://doi.org/10.1117/12.252077

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