Abstract
A simple mechanical setup was used to polish a standard single mode
optical fiber in order to make it asymmetric. The polished fiber was tapered
down maintaining the D-shape transversal profile. Its broken symmetry along
with the extended evanescent field, due to the dimensions of the microfiber,
implies a potentially high birefringent waveguide as well as a high-sensitivity
external refractive index device. An experimental maximum sensitivity of
$S\approx(3.0\pm0.2)\times10^4$
nm/RIU was achieved, other experimental and numerical results supporting
our initial assumptions are also presented.
© 2013 IEEE
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