Abstract
The modal properties of an air core photonic crystal fiber which
incorporates an anti-resonant feature within the region that marks the
transition between the air core and the crystal cladding are numerically
calculated. The field intensity at the glass/air interfaces is shown to be
reduced by a factor of approximately three compared to a fiber with more
conventional core surround geometry. The reduced interface field intensity
comes at the expense of an increased number of unwanted core interface
modes within the band gap. When the interface field intensity is associated
with modal propagation loss, the findings are in accord with recent
measurements on fabricated fibers which incorporate a similar antiresonant
feature.
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