Controlling hybrid nonlinearities in transparent conducting oxides via two-colour excitation

TL;DR

This paper demonstrates how combining interband and intraband nonlinearities in aluminium-doped zinc oxide via two-colour laser excitation enables dynamic control of optical properties, opening new avenues for ultrafast photonic applications.

Contribution

It introduces a novel method to control nonlinear optical responses in transparent conducting oxides using two-colour excitation, allowing tailored ultrafast permittivity dynamics.

Findings

Demonstrated dynamic modulation of permittivity using two-colour fields.

Achieved control over spectral tuning of optical pulses.

Showed potential for ultrafast optical switching applications.

Abstract

Nanophotonics and metamaterials have revolutionised the way we think about optical space (epsilon, mu), enabling us to engineer the refractive index almost at will, to confine light to the smallest of the volumes, and to manipulate optical signals with extremely small footprints and energy requirements. Significant efforts are now devoted to finding suitable materials and strategies for the dynamic control of the optical properties. Transparent conductive oxides exhibit large ultrafast nonlinearities under both interband and intraband excitations. Here, we show that combining these two effects in aluminium-doped zinc oxide via a two colour laser field discloses new material functionalities. Owing to the independence of the two nonlinearities the ultrafast temporal dynamics of the material permittivity can be designed by acting on the amplitude and delay of the two fields. We demonstrate the potential applications of this novel degree of freedom by dynamically addressing the modulation bandwidth and optical spectral tuning of a probe optical pulse.