@article{fc68bc686dd84ae09cede9b88c489796,
title = "Chiral Bound States in the Continuum in Plasmonic Metasurfaces",
abstract = "Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q-factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from a fundamental trade-off between Q-factor and circular dichroism (CD), presenting a significant hurdle that severely limits the independent control between CD and Q-factors. Here, 3D plasmonic metasurfaces are numerically demonstrated that overcome the trade-off and offer high-Q quasi-BIC resonances (Q ≈ 938) with strong CD (≈0.67) in the mid-infrared. These metasurfaces are made of integrated-resonance units consisting of a twisted vertical split-ring resonator (VSRR) and a wall. Importantly, this dissimilar dimer configuration unlocks a new degree of freedom to decouple the Q-factor and CD, that is, the Q-factor and CD can be relatively independently manipulated by the height of the wall and the twisted angle of the VSRR, respectively. These results provide novel paradigms to manipulate advanced chiroptical responses, with various applications that require strong CD with enhanced light–matter interaction.",
keywords = "bound states in the continuum, circular dichroism, high-Q resonances, nonlocality, plasmonic metasurfaces",
author = "Yuhu Tang and Yao Liang and Jin Yao and Chen, {Mu Ku} and Shirong Lin and Zhuo Wang and Jingcheng Zhang and Huang, {Xu Guang} and Changyuan Yu and Tsai, {Din Ping}",
note = "Funding Information: Y.L. and Y.T. contributed equally to this work. Y.L. and D.P.T. developed ideas. Y.L., J.Y., and Y.T. ran simulations. Y.L., Z.W., S.L., and D.P.T. performed theoretical studies. S.L., Z.W., C.Y., X.G.H., M.K.C, and J.Z. engaged in the result discussion. Y.L., X.G.H., C.Y., and D.P.T. provided supervision. Y.L. and Z.W. wrote the manuscript with contributions from all authors. Support is acknowledged from the Beijing-Hong Kong Universities Alliance (BHUA) fund, the Germany/Hong Kong Joint Research Scheme 2022/23 (NO. 9053045), the University Grants Committee / Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. AoE/P-502/20 and GRF Project: 15303521 and 11310522), National Natural Science Foundation of China (No. 12104296), the Shenzhen Science and Technology Innovation Commission Grant (No. SGDX2019081623281169), the Department of Science and Technology of Guangdong Province (2020B1515120073), and City University of Hong Kong (Project No. 9380131). Funding Information: Y.L. and Y.T. contributed equally to this work. Y.L. and D.P.T. developed ideas. Y.L., J.Y., and Y.T. ran simulations. Y.L., Z.W., S.L., and D.P.T. performed theoretical studies. S.L., Z.W., C.Y., X.G.H., M.K.C, and J.Z. engaged in the result discussion. Y.L., X.G.H., C.Y., and D.P.T. provided supervision. Y.L. and Z.W. wrote the manuscript with contributions from all authors. Support is acknowledged from the Beijing‐Hong Kong Universities Alliance (BHUA) fund, the Germany/Hong Kong Joint Research Scheme 2022/23 (NO. 9053045), the University Grants Committee / Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. AoE/P‐502/20 and GRF Project: 15303521 and 11310522), National Natural Science Foundation of China (No. 12104296), the Shenzhen Science and Technology Innovation Commission Grant (No. SGDX2019081623281169), the Department of Science and Technology of Guangdong Province (2020B1515120073), and City University of Hong Kong (Project No. 9380131). Publisher Copyright: {\textcopyright} 2023 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH.",
year = "2023",
month = apr,
doi = "10.1002/lpor.202200597",
language = "English",
volume = "17",
pages = "1--7",
journal = "Laser and Photonics Reviews",
issn = "1863-8880",
publisher = "Wiley-VCH Verlag",
number = "4",
}