Effect of plasma resonances on dynamic characteristics of double graphene-layer optical modulator

TL;DR

This paper investigates how plasma resonances influence the dynamic behavior of a double graphene-layer optical modulator, highlighting the potential for terahertz frequency operation through plasma oscillation excitation.

Contribution

It introduces a device model linking modulation depth to control voltage and frequency, emphasizing plasma resonance effects in double-graphene-layer structures.

Findings

Resonant increase in modulation depth at plasma frequency

Potential for terahertz frequency modulation

Dependence of modulation depth on control voltage

Abstract

We analyze the dynamic operation of an optical modulator based on double graphene-layer(GL) structure utilizing the variation of the GL absorption due to the electrically controlled Pauli blocking effect. The developed device model yields the dependences of the modulation depth on the control voltage and the modulation frequency. The excitation of plasma oscillations in double-GL structure can result in the resonant increase of the modulation depth, when the modulation frequency approaches the plasma frequency, which corresponds to the terahertz frequency for the typical parameter values.