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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 33, Iss. 31 — Nov. 1, 1994
  • pp: 7501–7510

Highly sensitive optical measurement techniques based on acousto-optic devices

P. A. Gass, S. Schalk, and J. R. Sambles  »View Author Affiliations


Applied Optics, Vol. 33, Issue 31, pp. 7501-7510 (1994)
http://dx.doi.org/10.1364/AO.33.007501


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Abstract

An optical measurement technique is presented that permits a direct measurement of the differential transmission or reflectivity of a sample. The technique is based on the use of an acousto-optic device to modulate rapidly the incident angle or wavelength of the probe beam. Detection of the resulting modulated signal by means of a lock-in amplifier gives a direct measure of the differential optical properties of the sample. It is demonstrated that this direct measurement of the differential can strongly enhance normally undetectable optical features, such as weakly coupled, Otto geometry surface plasmon polaritons. A development of the technique, which uses the optical analog of a phase-locked loop, is demonstrated to have an angular resolution of 6 × 10−6 deg. This permits the detection of the shift in the critical angle caused by a change of 10−6 in the refractive index of a gas mixture.

© 1994 Optical Society of America

History
Original Manuscript: August 3, 1993
Revised Manuscript: April 15, 1994
Published: November 1, 1994

Citation
P. A. Gass, S. Schalk, and J. R. Sambles, "Highly sensitive optical measurement techniques based on acousto-optic devices," Appl. Opt. 33, 7501-7510 (1994)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-33-31-7501


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