Abstract
We propose an inverse Wentzel–Kramer–Brillouin (WKB) method
for the construction of the refractive-index profiles of buried graded-index
planar waveguides from the measured effective indexes of the guided modes.
Our method involves experimental determination of the location of the peak
index in the buried profile, measurement of the effective indexes in air,
and an index-matching liquid, and application of a searching algorithm to
find the best-fit profile through inverting the WKB equations. We present
numerical examples and experimental results to demonstrate the performance
of the method.
© 2008 IEEE
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