Advanced manufacturing of dielectric meta-devices

Photonics Insights, Год журнала: 2024, Номер 3(2), С. R04 - R04

Опубликована: Янв. 1, 2024

Язык: Английский

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Abrupt lateral beam shifts from terahertz quasi-bound states in the continuum

Science Bulletin, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Bound states in the continuum (BICs) are notable photonics for their infinite Q factors. Perturbed BICs, or quasi-BICs (QBICs), have finite but ultra-high factors, enabling external coupling. So far, most studies focused on momentum-space properties of BICs and QBICs, with few discussions real space. Here, we experimentally demonstrate that QBICs can induce abrupt lateral beam shifts. By applying Brillouin zone folding to a compound grating waveguide, form QBIC band where all become QBICs. When excited at specific incident angles, these produce sudden shifts, rapidly disappearing as frequencies deviate from band. Using terahertz imaging, capture shifts different characterizing This work offers alternative insights into behaviors supports development advanced sensors wavelength division (de) multiplexers.

Язык: Английский

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Disorder-assisted real–momentum topological photonic crystal

Nature, Год журнала: 2025, Номер unknown

Опубликована: Фев. 26, 2025

Язык: Английский

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Strong Coupling and Electromagnetically Induced Transparency in Multiple-BIC-Driven Metasurfaces

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Март 11, 2025

Photonic quasi-bound states in the continuum (quasi-BICs) provide an excellent platform for strong light-matter interactions nanophotonics. In this work, we numerically and experimentally demonstrate that Si nanorod dimer metasurface offers a new paradigm realizing multiple wavelength-stabilized quality-factor-tunable quasi-BICs, through unique symmetry breaking method does not alter volume. A pronounced electromagnetically induced transparency (EIT) effect, exhibiting group time delay of 6.7 ps, coupling accompanied by characteristic anticrossing Rabi splitting are realized based on hybridization between bright mode neighboring quasi-BIC within multiresonant metasurface. Intriguingly, sharp window, with tunable bandwidth but stable wavelength, is achieved. All numerical results validated experimental demonstration. Our findings recipe wavelength-stabilized, quasi-BICs EIT-like effect. would find utility slow light, quantum storage, nonlinear optics.

Язык: Английский

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Resonance Wavelength Stabilization of Quasi-Bound States in the Continuum Constructed by Symmetry Breaking and Area Compensation

Nano Letters, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 6, 2024

Dielectric metasurface supported symmetry-protected bound states in the continuum (SP-BIC) provide an important platform for enhancing light-matter interactions. However, conversion of SP-BIC into quasi-BIC (QBICs) through symmetry breaking is often accompanied by a shift resonance wavelength. In this work, we present generalized viewpoint aimed at achieving wavelength stability QBICs and area compensation (SBAC). Three SBAC schemes propose are equal proportional along both

Язык: Английский

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Tailoring bound states in the continuum in symmetric-breaking terahertz photonic crystal slabs

Chinese Optics Letters, Год журнала: 2025, Номер 23(2), С. 023601 - 023601

Опубликована: Янв. 1, 2025

Язык: Английский

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Ultrahigh-Q Quasi-BICs via Precision-Controlled Asymmetry in Dielectric Metasurfaces

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Март 25, 2025

Achieving ultrahigh quality factor optical resonances is crucial for advancing low-threshold lasers, high-sensitivity sensors, and nonlinear photonics. While dielectric metasurfaces supporting quasi-bound states in the continuum (qBICs) show great potential, their experimental realization has been challenging due to difficulty of precisely controlling symmetry-breaking at nanoscale. Here, we introduce a precision-controlled symmetry-protected qBIC method using angular perturbations tune asymmetry, ensuring both high precision reproducibility Q-factors. In contrast traditional SP-qBIC excitation, which relies on uncontrolled our offers more accurate consistent control by tuning instead structural variations. Additionally, approach defines lower limit achievable Q-factors, providing reliable bound. The demonstration SP-qBICs composite nanoslit achieves record-breaking Q-factor 1.1 × 105-the highest reported date. These findings offer promising platform designing ultrahigh-Q resonators next-generation photonic-applications.

Язык: Английский

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High-Q photonic flat-band resonances for enhancing third-harmonic generation in all-dielectric metasurfaces

Newton, Год журнала: 2025, Номер unknown, С. 100057 - 100057

Опубликована: Март 1, 2025

Язык: Английский

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Steering high-Q intrinsic chiral quasi-bound states in the continuum via engineered 2.5D phase-change metasurfaces

Optics Letters, Год журнала: 2024, Номер 49(20), С. 5703 - 5703

Опубликована: Окт. 2, 2024

High-Q intrinsic quasi-bound states in the continuum (QBICs) require three-dimensional (3D) geometries with both in-plane and out-of-plane mirror symmetry breakings, hindering practical implementations due to complex architectures. Here we demonstrate that high-Q QBICs can be flexibly controlled by using engineered 2.5D phase-change metasurfaces of Ge 2 Sb Te 5 (GST). By introducing additional perturbations slant angle θ azimuthal φ , highly efficient circular dichroism (CD) for reflection transmission realized. The spinning-selected magnetic dipole (MD) is responsible chirality. CD robust variation structural parameters, its Q-factor resonance location tuned through phase transition GST.

Язык: Английский

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Functionality multiplexing in high-efficiency metasurfaces based on coherent wave interferences

Opto-Electronic Advances, Год журнала: 2024, Номер 0(0), С. 240086 - 240086

Опубликована: Янв. 1, 2024

Язык: Английский

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