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Creating pairs of exceptional points for arbitrary polarization control: asymmetric vectorial wavefront modulation

Author

Listed:
  • Zijin Yang

    (Tsinghua University
    Tsinghua University)

  • Po-Sheng Huang

    (National Cheng Kung University)

  • Yu-Tsung Lin

    (National Cheng Kung University)

  • Haoye Qin

    (Tsinghua University)

  • Jesús Zúñiga-Pérez

    (Sophia Antipolis
    Nanyang Technological University)

  • Yuzhi Shi

    (Tongji University)

  • Zhanshan Wang

    (Tongji University)

  • Xinbin Cheng

    (Tongji University)

  • Man-Chung Tang

    (Tsinghua University)

  • Sanyang Han

    (Tsinghua University)

  • Boubacar Kanté

    (University of California)

  • Bo Li

    (Tsinghua University
    Suzhou Laboratory)

  • Pin Chieh Wu

    (National Cheng Kung University
    National Cheng Kung University
    National Cheng Kung University)

  • Patrice Genevet

    (Sophia Antipolis
    Colorado School of Mines)

  • Qinghua Song

    (Tsinghua University
    Suzhou Laboratory)

Abstract

Exceptional points (EPs) can achieve intriguing asymmetric control in non-Hermitian systems due to the degeneracy of eigenstates. Here, we present a general method that extends this specific asymmetric response of EP photonic systems to address any arbitrary fully-polarized light. By rotating the meta-structures at EP, Pancharatnam-Berry (PB) phase can be exclusively encoded on one of the circular polarization-conversion channels. To address any arbitrary wavefront, we superpose the optical signals originating from two orthogonally polarized -yet degenerate- EP eigenmodes. The construction of such orthogonal EP eigenstates pairs is achieved by applying mirror-symmetry to the nanostructure geometry flipping thereby the EP eigenmode handedness from left to right circular polarization. Non-Hermitian reflective PB metasurfaces designed using such EP superposition enable arbitrary, yet unidirectional, vectorial wavefront shaping devices. Our results open new avenues for topological wave control and illustrate the capabilities of topological photonics to distinctively operate on arbitrary polarization-state with enhanced performances.

Suggested Citation

  • Zijin Yang & Po-Sheng Huang & Yu-Tsung Lin & Haoye Qin & Jesús Zúñiga-Pérez & Yuzhi Shi & Zhanshan Wang & Xinbin Cheng & Man-Chung Tang & Sanyang Han & Boubacar Kanté & Bo Li & Pin Chieh Wu & Patrice , 2024. "Creating pairs of exceptional points for arbitrary polarization control: asymmetric vectorial wavefront modulation," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44428-z
    DOI: 10.1038/s41467-023-44428-z
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    1. T. Gao & E. Estrecho & K. Y. Bliokh & T. C. H. Liew & M. D. Fraser & S. Brodbeck & M. Kamp & C. Schneider & S. Höfling & Y. Yamamoto & F. Nori & Y. S. Kivshar & A. G. Truscott & R. G. Dall & E. A. Ost, 2015. "Observation of non-Hermitian degeneracies in a chaotic exciton-polariton billiard," Nature, Nature, vol. 526(7574), pages 554-558, October.
    2. Jörg Doppler & Alexei A. Mailybaev & Julian Böhm & Ulrich Kuhl & Adrian Girschik & Florian Libisch & Thomas J. Milburn & Peter Rabl & Nimrod Moiseyev & Stefan Rotter, 2016. "Dynamically encircling an exceptional point for asymmetric mode switching," Nature, Nature, vol. 537(7618), pages 76-79, September.
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