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

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 and Xiangping Li ()
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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

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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Citations: View citations in EconPapers (4)

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DOI: 10.1038/s41467-022-31877-1

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