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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 9,
  • Issue 4,
  • pp. 040603-
  • (2011)

Rerouting end-face-TIR capable rays to significantly increase evanescent wave signal power

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Abstract

The critical findings associated with end-face total internal reflection (TIR) phenomemon we proved before are reported. In particular, these findings reveal that the end-face-TIR capable rays experience enormous mode mixing when encountering a roughened end face. As a result, 94% of the overall detectable power is contributed by this effect. With a smooth fiber end face, this figure is mere 52%. We interpret the mechanism behind these unusual phenomena and its significance for the performance enhancement of fiber optic evanescent wave sensor.

© 2011 Chinese Optics Letters

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