Femtosecond soliton diode on heterojunction Bragg-grating structure

TL;DR

This paper proposes a design for an all-optical femtosecond soliton diode using a heterojunction Bragg grating with asymmetric cholesteric liquid crystals, demonstrating nonreciprocal transmission and stable soliton propagation.

Contribution

It introduces a novel heterojunction Bragg grating structure for femtosecond soliton diodes, combining nonlinearity and asymmetry for nonreciprocal transmission.

Findings

Achieved nonreciprocal transmission ratio up to 120.

Demonstrated stable soliton propagation through the structure.

Analyzed effects of pulse width and wavelength on diode performance.

Abstract

We numerically propose a scheme for realizing an all-optical femtosecond soliton diode based on a tailored heterojunction Bragg grating, which is designed by two spatially asymmetric chirped cholesteric liquid crystals. Our simulations demonstrate that with the consideration of optical nonlinearity, not only the femtosecond diode effect with nonreciprocal transmission ratio up to 120 can be achieved, but also the optical pulse evolving into soliton which maintains its shape during propagation through the sample is observed. Further, the influence of pulse width and the carrier wavelength to the femtosecond diode effect is also discussed in detail. Our demonstrations might suggest a new direction for experimentally realizing the femtosecond soliton diode based on the cholesteric liquid crystals.