Negative frequency resonant radiation

TL;DR

This paper predicts and confirms a new mechanism called negative resonant radiation, where a second mode is generated from solitons by coupling to negative frequency dispersion, expanding understanding of soliton-related frequency shifts.

Contribution

It introduces the concept of negative resonant radiation, a novel mode generated via coupling to negative frequency dispersion in solitons, with experimental validation.

Findings

Confirmation of negative resonant radiation in bulk media

Observation of mode generation in photonic crystal fibers

Validation of theoretical predictions through measurements

Abstract

Optical solitons or soliton-like states shed light to blue-shifted frequencies through a resonant emission process. We predict a mechanism by which a second propagating mode is generated. This mode, called negative resonant radiation originates from the coupling of the soliton mode to the negative frequency branch of the dispersion relation. Measurements in both bulk media and photonic crystal fibres confirm our predictions.