Fields & Waves Lab
  • Research
  • Team
  • Papers
    • Journals
    • Books
    • Conferences
    • Preprints
  • News
  • Media
Our paper on non-Hermitian line waves published in ACS-PHOT
13 July 2020
Share on:

Our paper on “Line waves in non-Hermitian metasurfaces” [1], in collaboration with Andrea Alù (ASRC-CUNY), has been published in ACS Photonics.

  1. Moccia, M., Castaldi, G., Alù, A., & Galdi, V. (2020). Line waves in non-Hermitian metasurfaces. ACS Photonics 7(8), 2064–2072.
    • Abstract
    • BibTeX
    • DOI
    • PDF
    • Supplements

    Planar junctions between reactive surface impedances with dual character (capacitive/inductive) can sustain line waves localized both in-plane and out-of-plane around the discontinuity, which propagate unattenuated along one-dimensional paths. Due to their attractive properties, these waves are of potential interest in applications ranging from integrated photonics to optical sensing. Here, we introduce and explore a non-Hermitian platform supporting these exotic modes based on parity−time symmetry. Specifically, we show that line waves can occur in the presence of a uniform surface reactance (either capacitive or inductive) and a symmetric resistance discontinuity from negative to positive values (i.e., gain and loss). We study analytically and numerically the propagation properties of these waves and the underlying physical mechanisms and also illustrate their intriguing properties in terms of confinement, reconfigurability, spin-momentum locking and lasing. Finally, we address possible practical implementations based on photoexcited graphene. Our results hold intriguing potentials for applications in flat optics and reconfigurable photonics.

    @article{IJ143_ACS-PHOT_2020,
      title = {Line waves in non-{H}ermitian metasurfaces},
      doi = {10.1021/acsphotonics.0c00465},
      journal = {ACS Photonics},
      author = {Moccia, Massimo and Castaldi, Giuseppe and Al\`{u}, Andrea and Galdi, Vincenzo},
      month = aug,
      year = {2020},
      volume = {7},
      issue = {8},
      pages = {2064--2072},
      note = {https://pubs.acs.org/doi/suppl/10.1021/acsphotonics.0c00465/suppl_file/ph0c00465_si_001.pdf}
    }
    
  • news 78
  • metasurfaces 42
  • non-Hermitian 22

  • « Previous
  • Archive
  • Next »
  • Department of Engineering
  • University of Sannio
  • About
  • Join
  • Contact