Effects of pulse collisions in a multilayer system with noninstantaneous cubic nonlinearity

TL;DR

This paper investigates how pulse collisions in a multilayer nonlinear photonic crystal with noninstantaneous cubic nonlinearity lead to induced trapping effects, revealing new dynamics of light trapping and absorption.

Contribution

It explores the conditions for induced pulse trapping due to collisions in a multilayer system with noninstantaneous nonlinearity, extending understanding of pulse interactions.

Findings

Low-intensity pulses can be absorbed through trapping caused by collisions.

Induced trapping occurs during pulse collisions in the multilayer system.

Conditions for co- and counter-propagating pulse trapping are identified.

Abstract

The numerical simulations of an ultrashort pulse propagation in a one-dimensional nonlinear photonic crystal are carried out. It is known that the relaxation of cubic nonlinearity is the reason for the effect of pulse self-trapping in such multilayer system. In this paper we study further implications of this effect. It is shown that the trapped light absorbs additional low-intensity pulses which cannot be self-trapped \textit{per se}. On the other hand, such low-intensity pulses are subject of the so-called induced trapping when light gets trapped due to a collision of two such pulses. We consider the conditions for this effect in both cases of co- and counter-propagating pulses.