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Topological phase singularities in atomically thin high-refractive-index materials

Author

Listed:
  • Georgy Ermolaev

    (Moscow Institute of Physics and Technology)

  • Kirill Voronin

    (Moscow Institute of Physics and Technology)

  • Denis G. Baranov

    (Moscow Institute of Physics and Technology)

  • Vasyl Kravets

    (University of Manchester)

  • Gleb Tselikov

    (Moscow Institute of Physics and Technology)

  • Yury Stebunov

    (University of Manchester)

  • Dmitry Yakubovsky

    (Moscow Institute of Physics and Technology)

  • Sergey Novikov

    (Moscow Institute of Physics and Technology)

  • Andrey Vyshnevyy

    (Moscow Institute of Physics and Technology)

  • Arslan Mazitov

    (Moscow Institute of Physics and Technology
    Dukhov Research Institute of Automatics (VNIIA))

  • Ivan Kruglov

    (Moscow Institute of Physics and Technology
    Dukhov Research Institute of Automatics (VNIIA))

  • Sergey Zhukov

    (Moscow Institute of Physics and Technology)

  • Roman Romanov

    (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute))

  • Andrey M. Markeev

    (Moscow Institute of Physics and Technology)

  • Aleksey Arsenin

    (Moscow Institute of Physics and Technology
    GrapheneTek)

  • Kostya S. Novoselov

    (University of Manchester
    National University of Singapore
    Chongqing 2D Materials Institute)

  • Alexander N. Grigorenko

    (University of Manchester)

  • Valentyn Volkov

    (Moscow Institute of Physics and Technology
    XPANCEO)

Abstract

Atomically thin transition metal dichalcogenides (TMDCs) present a promising platform for numerous photonic applications due to excitonic spectral features, possibility to tune their constants by external gating, doping, or light, and mechanical stability. Utilization of such materials for sensing or optical modulation purposes would require a clever optical design, as by itself the 2D materials can offer only a small optical phase delay – consequence of the atomic thickness. To address this issue, we combine films of 2D semiconductors which exhibit excitonic lines with the Fabry-Perot resonators of the standard commercial SiO2/Si substrate, in order to realize topological phase singularities in reflection. Around these singularities, reflection spectra demonstrate rapid phase changes while the structure behaves as a perfect absorber. Furthermore, we demonstrate that such topological phase singularities are ubiquitous for the entire class of atomically thin TMDCs and other high-refractive-index materials, making it a powerful tool for phase engineering in flat optics. As a practical demonstration, we employ PdSe2 topological phase singularities for a refractive index sensor and demonstrate its superior phase sensitivity compared to typical surface plasmon resonance sensors.

Suggested Citation

  • Georgy Ermolaev & Kirill Voronin & Denis G. Baranov & Vasyl Kravets & Gleb Tselikov & Yury Stebunov & Dmitry Yakubovsky & Sergey Novikov & Andrey Vyshnevyy & Arslan Mazitov & Ivan Kruglov & Sergey Zhu, 2022. "Topological phase singularities in atomically thin high-refractive-index materials," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29716-4
    DOI: 10.1038/s41467-022-29716-4
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    References listed on IDEAS

    as
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