Modulation instability induced supercontinuum generation in liquid core suspended photonic crystal fiber with cubic-quintic nonlinearities

TL;DR

This paper introduces a liquid core suspended photonic crystal fiber (LCSPCF) with enhanced nonlinear properties for supercontinuum generation and other nonlinear optical applications, emphasizing the role of higher-order nonlinearities.

Contribution

The study demonstrates the improved nonlinear performance of LCSPCF and explores the effects of cubic-quintic nonlinearities on modulation instability and supercontinuum generation.

Findings

LCSPCF shows significant MI enhancement over conventional PCF.

Quintic nonlinearity increases MI for cooperative nonlinearities.

Qinic nonlinearity suppresses MI for competing nonlinearities.

Abstract

In this paper, we propose a liquid core suspended photonic crystal fiber (LCSPCF) as a potential waveguide structure for nonlinear applications. We emphasize the dramatic improvement of the nonlinear properties of the PCF through the infiltration of liquid and highlight the effect of suspension in the further enhancement of nonlinearity. To demonstrate the capability of LCSPCF, we perform a modulation instability (MI) study and illustrate the MI enhancement in the LCSPCF against conventional PCF. As the LCSPCF possesses high nonlinearity, it is important to consider the effects of higher-order nonlinearities. We observe that the quintic nonlinearity (QN) increases the MI for cooperating nonlinearities while it suppresses the MI for competing nonlinearities. We have also importantly studied the effect of QN on the MI induced supercontinuum generation (SCG) for silica and CS2 liquid core PCF. Thus, we propose the LCSPCF as a platform for nonlinear applications such as SCG, pulse compression, etc., owing to the presence of high and controllable nonlinear coefficients.