PT Symmetry and Singularity-Enhanced Sensing Based on Photoexcited Graphene Metasurfaces

Pai-Yen Chen and Jeil Jung
Phys. Rev. Applied 5, 064018 – Published 29 June 2016

Abstract

We introduce here a parity-time-(PT) symmetric system using an optically pumped, active graphene metasurface paired with a resistive metallic filament, realizing a unidirectional reflectionless propagation of terahertz (THz) waves. The amplified THz stimulated emission and tailored plasmon resonances in the graphene metasurface may achieve an equivalent negative-resistance converter at THz frequencies. We theoretically demonstrate that the combination of the spectral singularity in a PT-symmetric system and the chemical sensitivity of graphene may give rise to exotic scattering responses, strongly influenced by the presence of charged impurities in graphene at the spontaneous PT-symmetry-breaking point. This graphene-based PT-symmetric device may have broad relevance beyond the extraordinary manipulation of THz waves, as it may also open exciting prospects for detecting gas, chemical, and biological agents with high sensitivities.

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  • Received 3 April 2016

DOI:https://doi.org/10.1103/PhysRevApplied.5.064018

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pai-Yen Chen1,* and Jeil Jung2

  • 1Department of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan 48017, USA
  • 2Department of Physics, University of Seoul, Seoul 02504, Korea

  • *Corresponding author. pychen@wayne.edu

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Vol. 5, Iss. 6 — June 2016

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