Graphene-based voltage-tunable coherent terahertz emitter

TL;DR

This paper introduces a graphene-based heterostructure capable of emitting tunable terahertz radiation from 0.1 to 30 THz with high power density at room temperature, addressing a critical gap in THz source technology.

Contribution

It presents a novel multilayer graphene-boron-nitride heterostructure that functions as an efficient, room-temperature, voltage-tunable terahertz emitter.

Findings

Emits radiation in the 0.1-30 THz range.

Achieves power density up to 0.5 W/cm² at room temperature.

Device is thin, flexible, and nearly invisible.

Abstract

A portion of the electromagnetic wave spectrum between $\sim 0.1$ and $\sim 10$ terahertz (THz) suffers from the lack of powerful, effective, easy-to-use and inexpensive emitters, detectors and mixers. We propose a multilayer graphene -- boron-nitride heterostructure which is able to emit radiation in the frequency range $\sim 0.1-30$ THz with the power density up to $\sim 0.5$ W/cm$^2$ at room temperature. The proposed device is extremely thin, light, flexible, almost invisible and may completely cover the needs of science and technology in the sources of terahertz radiation.