A general model for designing the chirality of exciton-polaritons

Nanophotonics, Journal Year: 2025, Volume and Issue: 14(3), P. 407 - 416

Published: Jan. 31, 2025

Chirality of exciton-polaritons can be tuned by the chirality photons, excitons, and their coupling strength. In this work, we propose a general analytical model based on coupled harmonic oscillators to describe exciton-polaritons. Our predicts degree circular polarization (DCP) exciton-polaritons, which is determined DCPs weight fractions constituent excitons photons. At anticrossing point, DCP equally contributed from both constituents. Away relaxes toward dominant constituent, with relaxation rate decreasing as strength increases. We validate our through simulations strongly topological edge states showing good agreement predictions. provides valuable tool for designing strong systems offers framework inverse design tailored chirality.

Language: Английский

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Intrinsic strong self-hybrid coupling empowered by Brillouin zone folding-induced high-Q quasibound modes in van der Waals metasurfaces

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(4)

Published: Jan. 9, 2025

Bulk transition metal dichalcogenides (TMDs) provide a prominent platform for self-hybrid light-matter interactions, owing to their strong oscillator strength and large modal overlap. Recently the Brillouin zone folding-induced quasibound states in continuum (BZF-qBICs) have been attracting significant attention because of sustainable high quality (Q) factor momentum space robustness against disorder. However, studies on coupling based BZF-qBICs are rarely reported. Here, we propose simple design metasurface with holes punched into standalone bulk TMD flake demonstrate between BZF-qBIC resonances intrinsic exciton WS2. We show that induced by periodically perturbing radius air exhibit folded band structure reduced radiation channels, leading tunable Q factors. further introducing relative displacements perturbed break in-plane symmetry enables an intriguing from electric quadrupole toroidal dipole dominated BZF-qBICs, latter exhibiting robust polarization independence associated metasurface. This polarization-independent is used realize excitons Rabi splitting over 190 meV. Moreover, hybrid system can be modulated tuning perturbation holes. Our findings strategy strongly coupled platforms, which may serve as catalyst innovation high-performance optoelectronic devices. locked icon Physics Subject Headings (PhySH)Exciton polaritonLight-matter interactionMetasurfacesMetamaterials

Language: Английский

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Photonic-spin-controlled second-order nonlinear frequency conversion on permittivity-asymmetry lithium niobite dimer metasurfaces governed by chiral quasibound states in the continuum

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(7)

Published: Feb. 3, 2025

Language: Английский

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Transition-induced Q-BIC-exciton polaritons in a permittivity-asymmetric system

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(3)

Published: Jan. 8, 2025

Language: Английский

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Optically Transparent Dualband Microwave Chiral Metamaterial Based on ITO Strips

Optics Express, Journal Year: 2025, Volume and Issue: 33(2), P. 2995 - 2995

Published: Jan. 9, 2025

In this paper, an optically transparent dual-band microwave chiral metamaterial based on indium tin oxide (ITO) strips is proposed. The rotation angle and length of the three ITO structural layer can be varied to generate two independent frequency bands in circular dichroism (CD) spectrum. maximum CD value 0.72, optical transmittance reaches 64%. experimental simulation results are largely agreement. Moreover, a designed 2D image encoder proposed as potential application. device has considerable for application fields signal transmission, information coding, homeland security.

Language: Английский

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Second harmonic generation from bound-state in the continuum-hosted few-layers van der Waals metasurface

Nanophotonics, Journal Year: 2025, Volume and Issue: 14(2), P. 263 - 270

Published: Jan. 16, 2025

Monolayer transition metals dichalcogenides (TMDs) have been coupled to bound-state in the continuum (BIC) hosted dielectric structures attain high second harmonic generation (SHG). However, transvers electric modes are strongly localized waveguides result fairly weak exciton-photon coupling monolayer TMD placed on surface. To achieve SHG few-layers TMDs based BIC-inspired structure is a challenge. Here, we report BIC metasurface with quality factor (Q-factor), tunability, and modes-upholding different environments. The sustains at thickness of meta-atoms, which highly desired for maintaining accuracy fabrications. Next, calculate efficiency from around wavelengths. conversion this work 1.47 × 10-4 6 mW incident power. Moreover, our design thin can be used various linear non-linear applications optics. This study will provide new route next post-silicon metasurfaces.

Language: Английский

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Giant structurally modulated intrinsic chirality of quasi-bound states in continuum

Optics Letters, Journal Year: 2025, Volume and Issue: 50(5), P. 1649 - 1649

Published: Feb. 5, 2025

Structurally modulated intrinsic chirality is a structural transformation phenomenon in photoresponsive molecules that commonly utilized biosensing and chemical analysis. In this study, we proposed an approach to achieve giant quasi-bound state the continuum (Q-BICs)-slanted tetramer metasurface, where high Q factors circular dichroism (CD) coexist. Empowered by simultaneous resonance between toroidal dipole (TD) electric quadrupole (EQ) modes, can be effectively tuned via variations slant angles of metasurface. Our work not only addresses lack strong chiral materials nature but also opens up new possibilities chiroptical sensing, analysis, biotechnology.

Language: Английский

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Multifunctional bio-enzyme sensor empowered by bound states in the continuum via a Si-VO₂ metasurface

Physica Scripta, Journal Year: 2025, Volume and Issue: 100(4), P. 045504 - 045504

Published: Feb. 21, 2025

Abstract Bound states in the continuum (BIC) present a novel avenue for advancing high-quality factor metasurfaces, promising high-performance lasers, sensors, and nonlinear optical devices at nanoscale. Currently, sensors designed based on BIC have achieved good sensing performance. However, functionality of current metasurface is relatively singular, rendering them less chance complex scenarios. Specifically, taking bio-enzyme sensor as an example, since different bio-enzymes optimal reaction temperatures, it mostly inescapable to design multiple detection. In this paper, we developed multifunctional that can adapt temperatures bio-enzymes, meeting requirements The proposed consists two elliptical cylinders, which excite high-Q quasi-BIC resonance by changing their rotation angles. By introducing VO 2 film, external ambient temperature effectively manipulate transmission modulation depth quasi-BIC. Simulation results show maximum relative reach 296%. When combined with serves refractive index sensitivity high 370 nm RIU −1 30 °C 80 °C. Our work provides insights highly integrated tunable future.

Language: Английский

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Regulation of strong coupling between multiple BICs and excitons in bulk WS2 metasurfaces

Physica B Condensed Matter, Journal Year: 2025, Volume and Issue: unknown, P. 417141 - 417141

Published: March 1, 2025

Language: Английский

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Tailoring Quasi-BIC States in Liquid Crystal-Integrated WS₂ Nanostructured Metasurfaces for Tunable High Q-Factor Optoelectronic Devices

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 12, 2025

Language: Английский

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