Abstract
A subwavelength ${\rm
SiO}_{2}$-based optical waveguide with an air cladding and
a multilayered buffer is presented. This multilayered buffer includes alternating
low and high refractive index dielectric layers. The thicknesses of these
dielectric layers are chosen optimally by using genetic algorithm so that
the theoretical leakage loss of the present optical waveguide is minimized
($ < $0.001
dB/mm at the central wavelength, e.g., 1550 nm). The modal analysis with a
full-vectorial finite-difference method shows that the present ${\rm SiO}_{2}$ optical waveguide has
the ability of sharp bending with a very small bending radius $(\sim 10\ \mu{\rm m})$.
© 2009 IEEE
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