Towards quantum-limited coherent detection of terahertz waves in charge-neutral graphene
Övrig text i vetenskaplig tidskrift, 2019

Spectacular advances in heterodyne astronomy1,2 have been largely due to breakthroughs in detector technology3. To exploit the full capacity of future terahertz (∼300 GHz–5 THz) telescope space missions4, new concepts of terahertz coherent receivers are needed, providing larger bandwidths and
imaging capabilities with multipixel focal plane heterodyne arrays5. Here we show that graphene uniformly doped to the Dirac point, with material resistance dominated by quantum localization and thermal relaxation governed by electron diffusion, enables highly sensitive and wideband coherent detection of signals from 90 to 700 GHz and, prospectively, across the entire terahertz range. We measure on proof-of-concept graphene bolometric mixers an electron diffusion-limited gain bandwidth of 8 GHz (corresponding to a Doppler shift of 480 km s−1 at 5 THz) and intrinsic mixer noise temperature of 475 K (which would be equivalent to ~2 hν/kB at ν = 5 THz), limited by the residual thermal background in our setup. An optimized device will result in a mixer noise temperature as low as 36 K, with the gain bandwidth exceeding 20 GHz, and a local oscillator power of <100 pW. In conjunction with the emerging quantum-limited amplifiers at the intermediate frequency6,7, our approach promises quantum-limited sensing in
the terahertz domain, potentially surpassing superconducting technologies, particularly for large heterodyne arrays

hot electron bolometer

terahertz

graphene

HEB

mixer

Författare

Samuel Lara Avila

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

National Physical Laboratory (NPL)

Andrey Danilov

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Dmitry Golubev

Aalto-Yliopisto

Hans He

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Kyung Ho Kim

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Rositza Yakimova

Linköpings universitet

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Serguei Cherednichenko

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Nature Astronomy

23973366 (eISSN)

Vol. 3 11 983-988

Ämneskategorier

Acceleratorfysik och instrumentering

Styrkeområden

Informations- och kommunikationsteknik

Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)

Infrastruktur

Kollberglaboratoriet

Nanotekniklaboratoriet

DOI

10.1038/s41550-019-0843-7

Mer information

Senast uppdaterat

2022-04-05