Detector noise limits the performance of signal-processing-in-the-element detectors.
For detectors to be optimized, an expression for the signal and noise must be found.
The results of the eigenmode solution to the charge transport problem are used to
derive the power spectral density of the noise in analytic form. This result is then
coordinated with a similarly obtained modulation transfer function to yield a
frequency-dependent signal-to-noise ratio (SNR). The SNR is used to reveal
performance trends over several ranges of detector parameters. The most important
result is that the contact boundary velocity strongly controls the SNR. The optimum
SNR condition occurs when the contacts are not perfectly ohmic but exhibit a
partially blocking behavior.
© 1996 Optical Society of America
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