Abstract
The guiding properties of realistic silica/air hollow-core Bragg fibers have been
investigated by calculating the dispersion curves, the confinement loss spectrum, and
the field distribution of the guided modes through a full-vector modal solver based on
the finite-element method. In particular, the silica bridge influence on the fundamental
mode has been analyzed by comparing the properties of an ideal structure, without the
silica nanosupports, and of two realistic fibers, with squared off and rounded
air-holes. Simulation results have demonstrated the presence of anticrossing points in
the dispersion curves, associated to the transition of the fundamental mode into a
surface mode. It has been shown that surface modes are responsible for the sharp loss
peaks, also experimentally measured, which pollute the loss spectrum of the fundamental
mode and of the higher order modes. Then, the influence on the guiding properties of
each geometric characteristic in the hollow-core Bragg fiber cross-section has been
deeply investigated, thus showing which parameter it is better to change in order to
properly modify the loss values or its spectral behavior. Moreover, in order to improve
the loss properties of hollow-core Bragg fibers, the number of silica and air layers in
the fiber cladding has been increased, and the layer thickness has been modified.
Results have shown that the first change is more effective for the loss reduction, while
the second is useful for a spectral shift. Finally, among the different possible
applications, the feasibility of a DNA biosensor based on a hollow-core Bragg fiber has
been demonstrated.
© 2008 IEEE
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