Experimental evidence of optical analogue of electromagnetically induced transparency in graphene

TL;DR

This paper reports the first experimental observation of an optical analogue of electromagnetically induced transparency in graphene, using phase-sensitive pump-probe techniques to demonstrate coherent population oscillation and related nonlinear effects.

Contribution

It provides the first experimental evidence of optical EIT analogue in graphene, demonstrating phase-sensitive control of dispersion and absorption via coherent population oscillation.

Findings

Observation of coherent population oscillation in graphene.

Asymmetrical burning hole consistent with theoretical predictions.

Enhanced and depressed modulation instability observed.

Abstract

We demonstrate the first experimental observation of coherent population oscillation, an optical analogue of electromagnetically induced transparency, in graphene based on phase sensitive pump-probe system. Degenerate four-wave-mixing between pump and probe modifies the dispersion and absorption of the population oscillation process in graphene, and leads to enhance and depression of modulation instability with asymmetry in frequency. The analytically predicted asymmetrical burning hole fully consists with the experiments.