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Configuration of the sensor. The parameters are as follows: , , , , , and .
(solid curve) and (dashed curve) vs effective RI for the ultrahigh-order mode, simulated in stationary-phase method. The incident beam is TE polarized and in wavelength.
Principle of measurement by monitoring the change of GH shift caused by the variation of RI of the guiding layer. The parameters are as follows: , for pure water (solid curve), ; for NaCl solution (dashed curve), ; waist radius is .
Schematic drawing of the experimental setup.
The Goos–Hänchen shifts with respect to solutions of different concentrations in the sample cell: (a) pure water, (b) NaCl solution, (c) NaCl solution, (d) NaCl solution, and (e) NaCl solution.
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