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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 1 — Jan. 1, 2007
  • pp: 58–60

Effect of nonparallelism of guiding air–liquid layers on the reflection dip in attenuated total reflection

Yaojun Feng, Zhuangqi Cao, Qishun Shen, and Fan Chen  »View Author Affiliations

Applied Optics, Vol. 46, Issue 1, pp. 58-60 (2007)

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The effect attributable to the nonparallelism of the guiding layer of a planar waveguide on the reflection dip of the attenuated total reflection (ATR) spectrum is investigated. It is considered that the reflected light from a nonparallel waveguide is, indeed, the superposition of a series of beams propagating in different directions. The ATR spectra are numerically calculated with various inclination values. Compared with those of the corresponding parallel ones, with the inclination of waveguides exceeding 1 μrad, the characteristics of the ATR spectra begin to differ considerably, and when the inclination reaches 10 μrad, the sensitivity of sensors based on the waveguide is reduced by 62.7 % and 67.3 % for the free space coupling structure and the prism coupling structure, respectively. When the inclination becomes larger than 100 μrad , the ATR phenomenon cannot be observed any longer.

© 2007 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Optical Devices

Original Manuscript: June 9, 2006
Revised Manuscript: August 28, 2006
Manuscript Accepted: September 8, 2006

Yaojun Feng, Zhuangqi Cao, Qishun Shen, and Fan Chen, "Effect of nonparallelism of guiding air-liquid layers on the reflection dip in attenuated total reflection," Appl. Opt. 46, 58-60 (2007)

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