Crafting chirality in three dimensions via a novel fabrication technique for bound states in the continuum metasurfaces

Haddadin, Zaid; Nguyen, Anna My; Poulikakos, Lisa V.

doi:10.1038/s41377-023-01368-z

Cited by 1 publication

(1 citation statement)

References 26 publications

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“…In general, BICs can be classified into two categories: symmetry-protected BICs (Γ-BICs), deriving from the inherent symmetry of the system, and accidental BICs, deriving from that two or more radiation channels cancel one another in the far field . They can exist in several systems including photonic crystal slabs ,, Fabry–Perot cavity, and metasurfaces, − with various potential applications including biosensors, detectors, , and lasing. − …”

Section: Introductionmentioning

confidence: 99%

Evolution and Combination of Light Line Singularities in Planar Multilayers

Wang,

Liu,

Liu

et al. 2024

ACS Photonics

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In recent decades, optical singularities have been extensively investigated with intriguing phenomena and rich physics, including bound states in the continuum (BICs), exceptional points, and optical vortices. However, the behaviors of singularities at the light line have largely been ignored. Here, we reveal the generation and evolution of light line singularities and predict their distributions in planar configurations. Remarkably, when a system simultaneously supports light line singularities and BICs at the same point in the ω–k x space, combined singularities are generated. The combined singularities (including combined BICs) at both 0° and 90° show robust higher Q properties against the perturbation of the system compared with isolated BICs or light line singularities. For example, in a lossy system, the topological phase singularity pairs (TPSPs) resulting from combined singularities have 3 orders of magnitude larger Q factors than TPSPs from isolated ones. Furthermore, the positions of these TPSPs can be dynamically manipulated by inserting a monolayer graphene. Our findings expand the classification of optical singularities at the light line and enhance Q factors by combining singularities with potential applications such as nonlinear optics, lasers, and sensors.

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