Can Weak Chirality Induce Strong Coupling between Resonant States?

Chen, Yang; Chen, Weijin; Kong, Xiangying; Wu, Dong; Chu, Jiaru; Qiu, Cheng‐Wei

doi:10.1103/physrevlett.128.146102

Cited by 46 publications

(19 citation statements)

References 50 publications

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Section: Introductionmentioning

confidence: 99%

“…12,19,20 It has been reported that the strong coupling between two BICs in a metasurface, assisted by externally introduced enantiomers with weak chirality, can also bring large CD signals. 21 In this paper, we theoretically propose a dielectric metasurface composed of a silicon quadrumer structure. It can support the excitation of bound states in the continuum.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced chirality in a dielectric metasurface without breaking symmetry

Liu

Zhao

Zhang

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced chirality in a dielectric metasurface without breaking symmetry

Liu

Zhao

Zhang

et al. 2023

Phys. Chem. Chem. Phys.

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“…In comparison to the natural materials, the optical metasurfaces can showcase the enhanced and engineered optical responses by their lack of rotational symmetry or in-plane mirror-symmetry [ 6 , 7 ]. As a consequence, there have been enormous efforts devoted to achieving high-sensitivity optical sensing [ 8 ], metalens [ 9 ], optical switching [ 10 ], etc., in optical metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Sensing and Switches Enriched by Tailorable Multiple Fano Resonances in Rotational Misalignment Metasurfaces

Luo

Liu

et al. 2022

Nanomaterials

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Fano resonances that feature strong field enhancement in the narrowband range have motivated extensive studies of light–matter interactions in plasmonic nanomaterials. Optical metasurfaces that are subject to different mirror symmetries have been dedicated to achieving nanoscale light manipulation via plasmonic Fano resonances, thus enabling advantages for high-sensitivity optical sensing and optical switches. Here, we investigate the plasmonic sensing and switches enriched by tailorable multiple Fano resonances that undergo in-plane mirror symmetry or asymmetry in a hybrid rotational misalignment metasurface, which consists of periodic metallic arrays with concentric C-shaped- and circular-ring-aperture unit cells. We found that the plasmonic double Fano resonances can be realized by undergoing mirror symmetry along the X-axis. The plasmonic multiple Fano resonances can be tailored by adjusting the level of the mirror asymmetry along the Z-axis. Moreover, the Fano-resonance-based plasmonic sensing that suffer from mirror symmetry or asymmetry can be implemented by changing the related structural parameters of the unit cells. The passive dual-wavelength plasmonic switches of specific polarization can be achieved within mirror symmetry and asymmetry. These results could entail benefits for metasurface-based devices, which are also used in sensing, beam-splitter, and optical communication systems.

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“…As a result, BIC provides a unique opportunity to confine and manipulate electromagnetic wave within the radiative continuum. Leveraging by its theoretical infinite Q factor, many interesting physical mechanisms and promising applications have been explored and demonstrated, such as conservation of topological charges for polarization [10], manipulation of BICs in momentum space [11][12][13][14], lasing [15][16][17][18], chiroptical response [19][20][21], biosensing [22] and enhancement of Smith-Purcell radiation [23], just to name a few. Specifically, photonic crystal (PhC) resembles a promising platform for tailoring the properties of BIC, though genuine BIC only exists in an infinite PhC [5].…”

mentioning

confidence: 99%

“…It can be seen that two SP-BICs are strongly hybridized near the avoided crossing region. Because this interaction takes place at the Γ point, both hybridized modes remain SP-BICs [19]. At the same time, merging BICs can also be achieved for the BIC 1 by simply varying h/r (Supplemental Material [42], Sec.…”

mentioning

confidence: 99%

Super quasi-bound state in the continuum

Zhang¹,

Bulgakov²,

Pichugin³

et al. 2022

Preprint

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Avoided crossing of resonances and merging multiple bound states in the continuum (BICs) are parallel means for tailoring the physical properties of bound states in the continuum. Herein, we introduce a new concept of super quasi-bound state in the continuum for photonic crystal systems where its Q factor is boosted in both parametric and momentum spaces. A super quasi-BIC with substantial enhancement of quality Q factor can be achieved in a finite PhC by combining avoiding crossing of two symmetry protected (SP) quasi-BICs in parametric space and merging BICs in momentum space simultaneously. More importantly, analytical results show that the proposed mechanism will modify the asymptotic behavior of the quasi-BIC's Q factor over the numbers of resonators from N 2 to N 3 , which is of vital importance for realizing quasi-BICs in a compact PhC. Microwave experiments are performed to validate the theoretical results. Our results provide a paradigm shift for manipulating the physical properties quasi-BICs in finite PhC structures, which would facilitate various applications, including but not limited to low threshold lasing, wireless power transfer and high figure of merit sensing etc.

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Can Weak Chirality Induce Strong Coupling between Resonant States?

Cited by 46 publications

References 50 publications

Enhanced chirality in a dielectric metasurface without breaking symmetry

Enhanced chirality in a dielectric metasurface without breaking symmetry

Plasmonic Sensing and Switches Enriched by Tailorable Multiple Fano Resonances in Rotational Misalignment Metasurfaces

Super quasi-bound state in the continuum

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