Topological engineering of terahertz light using electrically tunable exceptional point singularities

  • M. Said Ergoktas
    Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Sina Soleymani
    Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802 USA.
  • Nurbek Kakenov
    Department of Physics, Bilkent University, Ankara, Turkey.
  • Kaiyuan Wang
    Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Thomas B. Smith
    Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.
  • Gokhan Bakan
    Department of Materials, University of Manchester, Manchester, M13 9PL, UK.
  • Sinan Balci
    Department of Photonics, Izmir Institute of Technology, Izmir, Turkey.
  • Alessandro Principi
    Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.
  • Kostya S. Novoselov
    Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.
  • Sahin K. Ozdemir
    Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802 USA.
  • Coskun Kocabas
    Department of Materials, University of Manchester, Manchester, M13 9PL, UK.

抄録

<jats:p>The topological structure associated with the branch point singularity around an exceptional point (EP) can provide tools for controlling the propagation of light. Through use of graphene-based devices, we demonstrate the emergence of EPs in an electrically controlled interaction between light and a collection of organic molecules in the terahertz regime at room temperature. We show that the intensity and phase of terahertz pulses can be controlled by a gate voltage, which drives the device across the EP. Our electrically tunable system allows reconstruction of the Riemann surface associated with the complex energy landscape and provides topological control of light by tuning the loss imbalance and frequency detuning of interacting modes. Our approach provides a platform for developing topological optoelectronics and studying the manifestations of EP physics in light–matter interactions.</jats:p>

収録刊行物

  • Science

    Science 376 (6589), 184-188, 2022-04-08

    American Association for the Advancement of Science (AAAS)

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