General Bound States in the Continuum in Momentum Space

Jiang, Qiao; Hu, Peng; Wang, Jun; Han, Dezhuan; Zi, Jian

doi:10.1103/physrevlett.131.013801

Cited by 16 publications

(6 citation statements)

References 34 publications

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“…(d) Left: polarization graph in momentum space. Right: merging of two general BICs and an off-normalΓ BIC with the variation of geometrical parameters [55] .…”

Section: Physical Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Wang,

Li,

Zhao

et al. 2024

Photonics Insights

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“…(d) Left: polarization graph in momentum space. Right: merging of two general BICs and an off-normalΓ BIC with the variation of geometrical parameters [55] .…”

Section: Physical Mechanismsmentioning

confidence: 99%

“…Based on the graph theory, more non-local properties of the BICs in momentum space can be revealed [55] . As is shown in the left panel of Fig.…”

Section: Physical Mechanismsmentioning

confidence: 99%

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Wang,

Li,

Zhao

et al. 2024

Photonics Insights

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“…As a vortexlike singularity (V point) with an undefined polarization state, the BIC cannot radiate outward to the far-field. 55,56 Nevertheless, the BIC can transition into high-Q quasi-BIC with low radiative losses by breaking structural symmetry or mismatching the mode coupling condition. 57,58 Subsequently, we disrupt the in-plane C 2 symmetry by introducing asymmetric perturbation (inset in Figure 3c), and the spatially symmetric field distribution of the BIC is consequently broken.…”

Section: Acsmentioning

confidence: 99%

Overcoming High-Quality Limitations in Plasmonic Metasurfaces for Ultrasensitive Terahertz Applications

Ren,

Hu,

et al. 2024

ACS Nano

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In photonics, achieving high-quality (Q) resonance is crucial for high-sensitivity devices used in applications, such as switching, sensing, and lasing. However, high-Q resonances are highly susceptible to internal losses of plasmonic devices, impeding their integration into broader systems across terahertz and visible light bands. Here, we overcome this challenge by proposing a low-Q plasmonic metasurface for ultrasensitive terahertz (THz) switching and sensing. Theoretically, we reveal an approach to constructing a low-Q resonator possessing high sensitivity to nonradiative losses. Leveraging this mechanism, we design a highly sensitive plasmonic metasurface induced by strong coupling between a quasi-bound state in the continuum and a dipole mode. By hybridizing with the germanium layer, the metadevice exhibits an ultralow pump threshold of 192 μJ/cm 2 and an ultrafast switching cycle time of 7 ps. Furthermore, it also shows a high sensitivity of 224 GHz/RIU in refractive index sensing. The proposed paradigm of constructing low-Q and high-sensitivity photonic devices can be applied to biosensing, wide-band filters, and sensitive modulators.

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“…More interestingly, due to the high symmetry at Γ point, a polarization singularity can form at this point with a non-zero topological charge. The evolution of the topological charges under symmetry control has been extensively studied both numerically and experimentally [9], [32]- [35].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Degenerate Pairs of Bound States in the Continuum With Broken Symmetry

Zhao,

Wang,

Chen

et al. 2024

IEEE Photonics J.

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Bound states in the continuum (BICs) with exceptionally high quality factors (Q factors) have become focal points in photonic device research, finding applications in nonlinear enhancement, laser generation, sensing, and beyond. In this study, we systematically investigate the intricate relationship between the in-plane symmetry groups of photonic crystals and symmetryprotected BICs (SP-BICs) using a rigorous group theory approach. By modifying the spatial distribution of refractive indices to perturb the C2 and C3 symmetries within a C6v photonic crystal slab, we introduce a novel method to enable precise tuning of BIC resonances, including the BIC frequency, Q factor, and polarization state. The proposed group theory approach and tuning mechanism establish a pioneering pathway for the design and tunability of BICs, opening avenues for the development of advanced photonic devices with tailored functionalities such as tunable lasers and optical sensors with enhanced performance.

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General Bound States in the Continuum in Momentum Space

Cited by 16 publications

References 34 publications

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Overcoming High-Quality Limitations in Plasmonic Metasurfaces for Ultrasensitive Terahertz Applications

Evolution of Degenerate Pairs of Bound States in the Continuum With Broken Symmetry

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