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Planar chiral metasurfaces with maximal and tunable chiroptical response driven by bound states in the continuum

Author

Listed:
  • Tan Shi

    (Jinan University)

  • Zi-Lan Deng

    (Jinan University)

  • Guangzhou Geng

    (Institute of Physics, Chinese Academy of Sciences)

  • Xianzhi Zeng

    (Jinan University)

  • Yixuan Zeng

    (Nanyang Technological University)

  • Guangwei Hu

    (Nanyang Technological University)

  • Adam Overvig

    (Advanced Science Research Center, City University of New York)

  • Junjie Li

    (Institute of Physics, Chinese Academy of Sciences)

  • Cheng-Wei Qiu

    (National University of Singapore)

  • Andrea Alù

    (Advanced Science Research Center, City University of New York)

  • Yuri S. Kivshar

    (Australian National University)

  • Xiangping Li

    (Jinan University)

Abstract

Optical metasurfaces with high quality factors (Q-factors) of chiral resonances can boost substantially light-matter interaction for various applications of chiral response in ultrathin, active, and nonlinear metadevices. However, current approaches lack the flexibility to enhance and tune the chirality and Q-factor simultaneously. Here, we suggest a design of chiral metasurface supporting bound state in the continuum (BIC) and demonstrate experimentally chiroptical responses with ultra-high Q-factors and near-perfect circular dichroism (CD = 0.93) at optical frequencies. We employ the symmetry-reduced meta-atoms with high birefringence supporting winding elliptical eigenstate polarizations with opposite helicity. It provides a convenient way for achieving the maximal planar chirality tuned by either breaking in-plane structure symmetry or changing illumination angle. Beyond linear CD, we also achieved strong near-field enhancement CD and near-unitary nonlinear CD in the same planar chiral metasurface design with circular eigen-polarization. Sharply resonant chirality realized in planar metasurfaces promises various practical applications including chiral lasers and chiral nonlinear filters.

Suggested Citation

  • Tan Shi & Zi-Lan Deng & Guangzhou Geng & Xianzhi Zeng & Yixuan Zeng & Guangwei Hu & Adam Overvig & Junjie Li & Cheng-Wei Qiu & Andrea Alù & Yuri S. Kivshar & Xiangping Li, 2022. "Planar chiral metasurfaces with maximal and tunable chiroptical response driven by bound states in the continuum," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31877-1
    DOI: 10.1038/s41467-022-31877-1
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    Cited by:

    1. Ufuk Kilic & Matthew Hilfiker & Shawn Wimer & Alexander Ruder & Eva Schubert & Mathias Schubert & Christos Argyropoulos, 2024. "Controlling the broadband enhanced light chirality with L-shaped dielectric metamaterials," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Chen, Hechong & Liu, Zihan & Lian, Shengdi & Quan, Qingying & Malomed, Boris A. & Li, Shuobo & Zhang, Yong & Li, Huagang & Deng, Dongmei, 2024. "Tunable beam splitting via photorefractive nonlinearity and its applications in chiral waveguide induction and vortex generation," Chaos, Solitons & Fractals, Elsevier, vol. 183(C).

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