Birefringence and dispersion of cylindrically polarized modes in nanobore photonic crystal fiber

TL;DR

This paper investigates how a nanoscale hollow channel in a photonic crystal fiber significantly enhances birefringence and dispersion of cylindrical modes, with tunable parameters demonstrated both experimentally and theoretically.

Contribution

It introduces a method to control birefringence and dispersion in photonic crystal fibers by adjusting nanobore and core diameters, providing new insights into fiber design.

Findings

Enhanced birefringence due to nanobore placement

Large split in group velocity and dispersion observed

Analytical model shows tunability of parameters

Abstract

We demonstrate experimentally and theoretically that a nanoscale hollow channel placed centrally in the solid glass core of a photonic crystal fiber strongly enhances the cylindrical birefringence (the modal index difference between radially and azimuthally polarized modes). Furthermore, it causes a large split in group velocity and group velocity dispersion. We show analytically that all three parameters can be varied over a wide range by tuning the diameters of the nanobore and the core.