Fast-light Assisted Four-Wave-Mixing in Photonic Bandgap

TL;DR

This paper demonstrates the first experimental observation of four-wave-mixing (FWM) within the photonic bandgap, enabled by fast-light effects that allow phase matching despite the usual energy confinement, opening new possibilities for nonlinear optics.

Contribution

It introduces a novel method to achieve FWM in the photonic bandgap using fast-light induced phase manipulation, challenging the conventional understanding of wave propagation in such structures.

Findings

Successful experimental observation of FWM in photonic bandgap

Enhanced FWM due to fast-light phase manipulation

Good agreement between simulation and experimental results

Abstract

Since the forward and backward waves are coupled with each other and a standing wave with no net propagation of energy is formed in the photonic bandgap, it is a commonsense of basic physics that, any kinds of effects associated with wave propagation including four-wave-mixing (FWM) are thought to be impossible. However, we lay great emphasis here on explaining that this commonsense could be broken under specific circumstances. In this article, we report with the first experimental observation of the energy conversion in the photonic bandgap into other channel via FWM. Owing to the phase manipulation by fast light effect in the photonic bandgap, we manage to achieve the phase-match condition and thus occurred FWM transfer energy into other channels outside the photonic bandgap efficiently. As one-dimensional photonic crystal, simulations on fiber Bragg grating (FBG) with and without fast light were conducted respectively, and an enhanced FWM in photonic bandgap of FBG was observed. The experimental result shows great agreement with the analysis.