Abstract
Modal characteristics of resonantly-guided modes (RGMs) in microstructured fibers were investigated through numerical simulation. The modes of interest are supported in a class of fibers consisting of a circularly arranged periodic array of high index rods embedded in a low index cladding. Light is confined and guided by the guided-mode resonance (GMR) that the rod array exhibit. According to the numerical analysis we clarified that duplicated transverse modes having the same radial mode number for TM and TE modes were supported. Also the existence and detailed mode profiles of hybrid modes were confirmed.
Highlights
Various kinds of microstructured optical fibers (MOFs) such as photonic crystal fibers (PCFs) have been developed and applied to a number of industrial fields including telecommunication and sensing [1,2]
Starting from all-silica photonic crystal fibers [4,5], utilization of functional materials such as chalcogenide glasses in the fiber structure have been successfully demonstrated in experiments [6,7]
Recent progress of fabrication technologies made it possible to manufacture all-solid MOFs consisting of chalcogenide glass/silica [8,9]
Summary
Various kinds of microstructured optical fibers (MOFs) such as photonic crystal fibers (PCFs) have been developed and applied to a number of industrial fields including telecommunication and sensing [1,2]. In [15,16] we have reported a new class of confined modes in all-solid MOFs. The fiber consisted of a circularly arranged array of high-index rods (Si) embedded in a low-index host material (silica). Key mechanism of the light confinement is the guided-mode resonance (GMR) [17] that the rod array exhibits against a cylindrical wave [18] that forms a transverse fiber mode. Differences between the MOF for RGMs and conventional circular fibers are clarified from a viewpoint of possible supported modes. In MOFs for RGM, light is confined by the reflection due to GMR of the rod array. Reflecting Optical Waveguide) modes in MOFs [20] The point of their differences, and requirements for a MOF to support ARROW or RGM can be summarized as follows:. For a curved rod array, peak reflectivity is determined by the bending loss of the WGM
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