Mechanical and Optical Characterization of a Suspended Core Fiber Exhibiting Fundamental-Mode Cutoff Wavelength in Presence of Nanoscale Air Holes in the Core Region

TL;DR

This study investigates a novel suspended core fiber with nanoscale air holes, revealing unique mode cutoff behavior and enhanced optical properties, supported by mechanical and optical analysis across different materials and designs.

Contribution

It introduces a new fiber design with nanoscale air holes exhibiting fundamental mode cutoff, analyzing its mechanical and optical properties and potential sensing enhancements.

Findings

Fundamental mode cutoff at short wavelengths due to air holes.

Improved birefringence and evanescence sensing capabilities.

Relations between geometry and cutoff conditions established.

Abstract

In this work, mechanical and optical characterization of a new type of suspended core fiber (SCF) has been performed. The proposed SCF along with additional central air holes exhibits an unusual property of fundamental mode cutoff at short wavelengths. Two variants (single hole and double hole) of design under two different fiber platforms (SiO2 and As2Se3) have been considered to develop better insight into the mechanical and optical properties of the structure deploying plane strain and full vector eigen analysis, respectively. Dependence of thermal stress likely to be present in such nanostructured fibers on fiber materials and geometries are thoroughly studied. A relation between the cutoff condition and geometrical parameters of the design has been obtained with reference to characteristic decay length which nullifies the possibility of any numerical artifact. In addition, improvement of fiber birefringence and evanescence sensing capability due to the presence of such air holes in the guided region has been theoretically demonstrated. Effects of such air holes on fiber properties like GVD and mode mismatch are also studied with a relation to power confinement inside such nano scale regions.