Tree-wave mixing of ordinary and backward electromagnetic waves: extraordinary transients

TL;DR

This paper investigates three-wave mixing involving ordinary and backward electromagnetic waves in metamaterials, revealing extraordinary transient phenomena that enhance optical parametric processes and nonlinear reflectivity.

Contribution

It introduces the concept of extraordinary transient processes in backward wave mixing within metamaterials, highlighting their impact on optical amplification and frequency shifting.

Findings

Enhanced optical parametric amplification due to transient effects

Frequency up/down shifting nonlinear reflectivity observed

Transient responses resemble slowed oscillator behavior

Abstract

Three-wave mixing of ordinary and backward electromagnetic waves in pulsed regime is investigated in the metamaterials, which enable co-existence and phase matching of such waves. It is shown that opposite direction of phase velocity and energy flux in backward waves gives rise to extraordinary transient processes in greatly enhanced optical parametric amplification and in frequency up or down shifting nonlinear reflectivity. The discovered transients resemble slowed response of an oscillator on pulsed excitation in the vicinity of its resonance