Observation of Giant Extrinsic Chirality Empowered by Quasi-Bound States in the Continuum

Wu, Jiaju; Xu, Xiaotian; Su, Xiaoqiang; Zhao, Song; Wu, Chao; Sun, Yong; Li, Yunhui; Wu, Feng; Guo, Zhiwei; Jiang, Haitao; Chen, Hong

doi:10.1103/physrevapplied.16.064018

Cited by 49 publications

(17 citation statements)

References 77 publications

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“…[14,15] To date, many schemes have been proposed to construct chiral plasmonics, such as gold helix, [16] multilayer twisted configurations, [17,18] near-field coupling dimers, [19][20][21] DNA origami, [22,23] folded metasurfaces empowered by Nanokirigami, [24,25] superlattice far-field interference, [26,27] and extrinsic optical chirality in achiral metasurfaces. [28,29] However, the above-mentioned schemes suffer from a common disadvantage of low Q-factor resonances (often Q ≈ 10) due to intrinsic plasmonic damping and radiation loss. This inevitably hinders their potential applications in the fields requiring sharp resonance with strong field enhancement.…”

Section: Introductionmentioning

confidence: 99%

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Tang

Liang

Yao

et al. 2023

Laser & Photonics Reviews

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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.

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Section: Introductionmentioning

confidence: 99%

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Tang

Liang

Yao

et al. 2023

Laser & Photonics Reviews

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“…41 Fortunately, the small perturbation from breaking in the mirror symmetry of metasurfaces not only enables the symmetry-protected BICs to be transformed into externally accessible quasi-BICs (Q-BICs) [42][43][44][45][46][47] with ultrahigh Q-factors but also may give rise to the chiral response. [48][49][50][51][52] On the other hand, the BICs have been proved to be vortex centers in the polarization directions of far-field radiation. 53 The winding structure of polarization states in the momentum space offers a new avenue to modulating polarization.…”

Section: Introductionmentioning

confidence: 99%

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Zhou

Wei

et al. 2023

Nanoscale

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“…In the same year, Jiaju Wu et al studied the interaction between non-chiral meta-surfaces and circularly polarized light. They found that, when the mirror symmetry of the system formed by the non-chiral meta-surface and the incident light was broken, the continuum quasi-bound states could obtain about 85% of the optical chirality signal outside the non-chiral meta-surface [13] .…”

Section: Introductionmentioning

confidence: 99%

Optical chirality signal enhancement of spherical particles based on polarization vortex beams

Zeng,

Chen,,

Zhao

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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In order to analyze the mechanism of optical chirality signal enhancement of chiral spherical particles, the scattering properties of chiral particles were studied based on the T-matrix method, and the optical chirality signal is calculated under different types of polarization vortex beams with orbital angular momentum (OAM). Firstly, for particles with fixed sizes, the enhancement effects of tightly focused light field of radial and azimuthally polarized polarization beams were explored. In addition, for particles with varying sizes, the enhancement of the optical chirality signal of particles was achieved by controlling the order of OAM carried by the beam.

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Observation of Giant Extrinsic Chirality Empowered by Quasi-Bound States in the Continuum

Cited by 49 publications

References 77 publications

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Optical chirality signal enhancement of spherical particles based on polarization vortex beams

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