Teraherz photomixing using plasma resonances in double-graphene layer structures

TL;DR

This paper introduces a novel terahertz photomixer using double-graphene layers that exploits plasma resonances and electron transitions, achieving high efficiency and power at specific resonant frequencies.

Contribution

It presents a new model for a graphene-based photomixer that leverages plasma resonances for enhanced terahertz emission, surpassing traditional heterostructure devices.

Findings

Output power peaks sharply at plasmonic resonant frequencies.

Resonant peaks significantly exceed powers at lower frequencies.

High quantum efficiency and short transit times improve performance.

Abstract

We propose the concept of terahertz (THz) photomixing enabled by the interband electron transitions due to the absorption of modulated optical radiation in double-graphene layer (double-GL) structures and the resonant excitation of plasma oscillations. Using the developed double-GL photomixer (DG-PM) model, we describe its operation and calculate the device characteristics. The output power of the THz radiation exhibits sharp resonant peaks at the plasmonic resonant frequencies. The peak powers markedly exceed the output powers at relatively low frequencies. Due to relatively high quantum efficiency of optical absorption in GLs and short inter-GL transit time, the proposed DG-PM operating in the resonant plasma oscillation regime can surpass the photomixers based on the standard heterostructures .