What is the reason be evanscent wavein photonic cystal fiber??
Dear Suadd, physical reason the same as in the case TIR of light on rectangular glass prism - tunneling effect which is described by numerical approach in quantum mechanics
Dear Suadd, you can see a detailed explanation in the following paper:
Demonstration of the evanescent wave through absorption
R. Weigand and J. M. Guerra
Am. J. Phys. 64, 913 (1996); http://dx.doi.org/10.1119/1.18121
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