Confinement loss of anti-resonant capillaries with curved boundaries

Wei Wang, David Bird

Research output: Contribution to journalArticlepeer-review

Abstract

A systematic analysis of the dependence of the confinement loss of an anti-resonant capillary on the curvature of the core surround is presented. The core boundary is described by circular arcs and the construction allows for a wide range of core shapes to be considered. It is found that both negative and positive curvatures substantially reduce the confinement loss relative to that of a circular anti-resonant capillary and that this effect is insensitive to the size of the core relative to the wavelength and to the properties of the glass capillary wall. In contrast, for a solid core surround there is a small increase in the confinement loss with curvature. Results of scalar and vector calculations are shown to be similar. A qualitative explanation of the results is proposed based on azimuthal confinement of the wave fields generated by the curved boundaries.

Original languageEnglish
Pages (from-to)25314-25326
Number of pages13
JournalOptics Express
Volume29
Issue number16
Early online date23 Jul 2021
DOIs
Publication statusPublished - 2 Aug 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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