Record Details

Photon detectors: Thermal background noise-equivalent power with frequency-dependent detector efficiency

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Photon detectors: Thermal background noise-equivalent power with frequency-dependent detector efficiency
 
Creator RAGHAVAN, A
JHA, SS
 
Subject noise-equivalent-power
thermal background noise
photon detection
 
Description Background thermal noise often becomes the limiting factor while detecting low signals of photon flux from a distant thermal source. This cannot be eliminated by simply cooling the photodetector. A general method is developed here to calculate the background thermal noise and the noise equivalent power (NEP) for background source temperature T, with any given frequency-dependent quantum efficiency function eta(v) for the photodetector. Applications of our analysis to some specific model forms of eta(v), with finite bandwidths, show that earlier calculations are highly inadequate for peak efficiency frequencies v(o) < k(B)T/h, where k(B) is the Boltzmann constant and h is the Planck constant. The NEP, which determines the limit on the lowest signal power that can be detected by any given photodetector, is much higher in these frequency regions compared to earlier approximate estimates.
 
Publisher NATL INST SCIENCE COMMUNICATION
 
Date 2011-08-19T06:01:32Z
2011-12-26T12:56:05Z
2011-12-27T05:44:15Z
2011-08-19T06:01:32Z
2011-12-26T12:56:05Z
2011-12-27T05:44:15Z
2004
 
Type Article
 
Identifier INDIAN JOURNAL OF PURE & APPLIED PHYSICS, 42(10), 722-728
0019-5596
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10249
http://hdl.handle.net/10054/10249
 
Language en