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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 1 — Jan. 29, 2008

Photoconductive arrays for monitoring motion of spatial optical intensity patterns

Philip Heinz and Elsa Garmire  »View Author Affiliations


Applied Optics, Vol. 46, Issue 35, pp. 8515-8526 (2007)
http://dx.doi.org/10.1364/AO.46.008515


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Abstract

We describe a photodetector array based on photoconductance-monitoring by four-point probing. This detection scheme is aimed specifically at detecting changes within a speckle or microscopic fringes within a larger nonuniform optical intensity distribution. One specific application is the detection of lateral displacements of these speckles or fringes, for example, in laser light reflected from optically rough vibrating surfaces. With a prototype, we have detected subnanometer surface displacements interferometrically. We also demonstrate speckle-based, noninterferometric detection of a guitar body's vibrations at a standoff distance of 6   m with nanowatt power. We observe and explain the prototype's limited frequency response by considering space-charge effects. This detection scheme is most useful in low-power, low-frequency applications.

© 2007 Optical Society of America

OCIS Codes
(260.3160) Physical optics : Interference
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(250.0040) Optoelectronics : Detectors

ToC Category:
Detectors

History
Original Manuscript: November 27, 2006
Revised Manuscript: September 25, 2007
Manuscript Accepted: September 11, 2007
Published: December 7, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Philip Heinz and Elsa Garmire, "Photoconductive arrays for monitoring motion of spatial optical intensity patterns," Appl. Opt. 46, 8515-8526 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-46-35-8515

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