OTR

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.087701

Phys. Rev. Lett. 124, 087701 (2020)

journals.aps.org

Abstract

We propose a new type of optical transistor for a broadband amplification of terahertz radiation. It is made of a graphene-superconductor hybrid, where electrons and Cooper pairs couple by Coulomb forces. The transistor operates via the propagation of surface plasmons in both layers, and the origin of amplification is the quantum capacitance of graphene. It leads to terahertz waves amplification, the negative power absorption, and as a result, the system yields positive gain, and the hybrid acts like an optical transistor, operating with the terahertz light. It can, in principle, amplify even a whole spectrum of chaotic signals (or noise), which is required for numerous biological applications.

DOI:https://doi.org/10.1103/PhysRevLett.124.087701

© 2020 American Physical Society

Charge density wavesOptical & microwave phenomenaPlasmonsPolaritonsSpontaneous emissionUltrafast phenomena

GrapheneLow-temperature superconductors

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

K. H. A. Villegas¹, F. V. Kusmartsev^2,3,*, Y. Luo^2,†, and I. G. Savenko^1,4

• ¹Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Korea
• ²Micro/Nano Fabrication Laboratory (MNFL), Microsystem and Terahertz Research Center, Chengdu, China
• ³Physics Department, Loughborough University, Loughborough LE11 3TU, United Kingdom
• ⁴A. V. Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia

• ^*Corresponding author. F.Kusmartsev@lboro.ac.uk
• ^†luoyi@mtrc.ac.cn

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