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- Title
Chiral Bound States in the Continuum in Plasmonic Metasurfaces.
- Authors
Yuhu Tang; Yao Liang; Jin Yao; Mu Ku Chen; Shirong Lin; Zhuo Wang; Jingcheng Zhang; Xu Guang Huang; Changyuan Yu; Din Ping Tsai
- 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.
- Subjects
PLASMONICS; DEGREES of freedom; CIRCULAR dichroism; QUALITY factor; RESONATORS; RESONANCE; BOUND states
- Publication
Laser & Photonics Reviews, 2023, Vol 17, Issue 4, p1
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.202200597