Abstract
A near-surface-core optical fiber is proposed that consists of a cladding
and a circular or an elliptical core close to the surface of the cladding.
The finite element method (FEM) is utilized to analyze characteristics of
the near-surface-core optical fiber, including the mode characteristic, birefringence,
and evanescent field. The results reveal that the near-surface-core optical
fiber has polarization- preserving properties and a non-zero cut-off frequency
for the fundamental mode. The near-surface-core optical fiber has a strong
evanescent field due to a small distance between the core and the ambient
medium and is a promising candidate for evanescent wave sensors. The near-surface-core
optical fiber has an interesting phenomenon of surface-enhanced optical effect,
which is similar to that of the nanofiber.
© 2011 IEEE
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