Multiband quasibound states in the continuum engineered by space-group-invariant metasurfaces

Chai, Ruoheng; Liu, Wenwei; Li, Zhancheng; Cheng, Hua; Tian, Jianguo; Chen, Shuqi

doi:10.1103/physrevb.104.075149

Cited by 34 publications

(14 citation statements)

References 48 publications

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“…At the same time, the other guided mode is leakier due to constructive interference. In addition, the symmetry and topological properties of BICs are revealed at both highly symmetric and general points in momentum space. ,− Very recently, a novel class of BICs has been achieved by engineering Bragg scattering processes in metagratings, which can be tailored by the Fourier components of the nanostructures’ dielectric functions . In contrast to the conventional BICs that are located at discrete points in the momentum space and show a sharp decline in the Q factors when deviating from BIC points, the metagratings with meticulously engineered Fourier components support BICs at arbitrary bands in a considerable range centered on the highly symmetric points (for example, Γ points).…”

Section: Novel Optical Effectsmentioning

confidence: 99%

Emerging Planar Nanostructures Involving Both Local and Nonlocal Modes

Chai

Liu

et al. 2023

ACS Photonics

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With the capabilities to localize light at the subwavelength scale and flexibly control the full dimensions of electromagnetic fields, planar optical artificial nanostructures have been widely explored to innovate next-generation multifunctional compact photonic devices in recent decades. To further improve the efficiency, quality (Q) factors, and design degrees of freedom of photonic devices, recent research advances have brought in comprehensive consideration of both local and nonlocal modes in nanostructures with blurred distinctions between metasurfaces and photonic crystals. In this Perspective, we review the recent progress in planar nanophotonics involving localized resonances, nonlocal modes, and their couplings. Many intriguing physical effects correlated to local and/or nonlocal modes and the corresponding applications are reviewed, as well as large-area optimization strategies to directly simulate local and nonlocal optical responses. We also summarize several current challenges and foresee various future directions of the attractive field.

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Section: Novel Optical Effectsmentioning

confidence: 99%

Emerging Planar Nanostructures Involving Both Local and Nonlocal Modes

Chai

Liu

et al. 2023

ACS Photonics

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“…[56] Recently, Yang et al realized significant improvement in third harmonic generation based on magnetic resonances induced BIC mode, [57] which efficiently suppresses the far-field fundamental radiation due to its high-Q factor nature. [58,59] Compared with the conventional designs with local resonances, the guided mode can also be employed to improve the Q factor of metasurfaces within an ultra-thin surface. [60][61][62] It should be noted that the nonlocal resonances are not limited to guided modes.…”

Section: Nonlocal Resonances Generated By Artificial Arraysmentioning

confidence: 99%

Design Strategies and Applications of Dimensional Optical Field Manipulation Based on Metasurfaces

Liu

Ansari

et al. 2023

Advanced Materials

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Recent rapid progress in metasurfaces is underpinned by the physics of local and nonlocal resonances and the modes coupling among them, leading to tremendous applications such as optical switching, information transmission, and sensing. In this review paper, an overview of the recent advances in a broad range of dimensional optical field manipulation based on metasurfaces categorized into different classes based on design strategies is provided. This review starts from the near‐field optical resonances of artificial nanostructures and discusses the far‐field optical wave manipulation based on fundamental mechanisms such as mode generation and mode coupling. The recent advances in optical field manipulation based on metasurfaces in different optical dimensions such as phase and polarization are summarized, and newly‐developed dimensions such as the orbital angular momentum and the coherence dimensions resulting from phase modulation are discussed. Then, the recent achievements of multiplexing and multifunctional metasurfaces empowered by multidimensional optical field manipulation for optical information transmission and integrated applications are reviewed. Finally, the paper concludes with a few perspectives on emerging trends, possible directions, and existing challenges in this fast‐developing field.

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“…39 The nearly real eigenfrequency mode, 40 characterized by an unbounded Q-factor and vanishing linewidth, indicates that the ideal BICs will be invisible in absorptance spectra and cannot be externally accessed. 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.…”

Section: Introductionmentioning

confidence: 99%