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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Recent Advances in Dielectric Chiral Metasurfaces

Advanced Physics Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Natural chiral materials commonly possess weak chirality. Strong chirality can be achieved using metasurfaces or metamaterials consisting of atom‐like subwavelength units. Chiral metasurfaces, as a surface layer units, have gained much attention recently, since they are more easily fabricated than while the strong is retained. Compared with metal ones, dielectric low material loss and support rich localized resonance. Here, we review various which classified based on geometry configuration, including three‐dimensional (the unit cell not uniform along height direction) planar direction). To further enhance effect, periodic coupling may adopted to reduce leakage improve resonant quality factor excited field. Various introduced, their potential applications discussed. Dielectric provide new tool in manipulation important applications.

Language: Английский

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Nonlinear optical metasurfaces empowered by bound-states in the continuum

Reviews in Physics, Journal Year: 2025, Volume and Issue: unknown, P. 100117 - 100117

Published: April 1, 2025

Language: Английский

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High‐Q Chiral Metasurfaces: Broadband Spectral Tunability with Angle‐Dependent Response

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract Chiral metaphotonics are essential for many applications such as enantioselective sensing where high‐quality factor (Q) resonances and strong chiroptical activity demanded. Furthermore, spectral tuning using the same structure without compromising high‐Q chiral responses is highly desirable. This study presents a silicon‐based metasurface that maintains broadband across its full operational band, enabling through adjusting in‐plane wavevector while preserving high Q factors circular dichroism (CD) values. The metasurface, composed of silicon pillars on slab, demonstrates bands in both directions. confirmed by mode CD calculated from eigenfields transmittance far‐field spectra full‐wave simulations. angle‐dependent measured fabricated exhibit quality 1100, value 0.61, an angular range 12°, good agreement with numerical predictions. Additionally, enhanced third harmonic generation this nonlocal exhibits further improved nonlinear (0.95), which can also be spectrally tuned varying incident angle. These findings lay groundwork advanced metasurfaces operating over extensive ranges, significant implications requiring precise matching tunable responses.

Language: Английский

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Artificially Engineered Nonlinear Circular Dichroism with Chiral Nanoscrolling of 2D Materials

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: May 12, 2025

Nonlinear chiroptical response, particularly nonlinear circular dichroism (CD), holds significant potential for advancing nanotechnology, biophotonics, and molecular imaging. While conventional approaches rely on intrinsic chiral materials, we demonstrate a novel strategy to engineer this effect by transforming achiral two-dimensional (2D) transition-metal dichalcogenides (TMDs) into nanostructures. By scrolling monolayer TMDs geometrically nanoscrolls, achieve pronounced CD (up 0.8), evidenced circular-polarization-dependent second-harmonic generation (SHG). Notably, the SHG-CD degree is tailored controlling nanoscrolls' axes, demonstrating, first time, programmable chirality-dependent responses in TMD nanoscrolls. Furthermore, confined electromagnetic fields within scrolled geometry amplify SHG intensity up 100-fold compared monolayers. This nanoscrolling anticipated enable innovative functionalities realm of compact light sources modulators, heralding new era advanced photonic applications.

Language: Английский

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Nonlinear chiroptical response in lithium niobate metasurface driven by quasi-bound states in the continuum

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(21)

Published: Nov. 18, 2024

Quasi-bound states in the continuum (QBIC) can significantly localize light field and enhance light–matter interactions at nanoscale, providing a platform for high-Q chiral response promoting nonlinear effects of materials. In this work, we numerically study linear responses QBIC lithium niobate (LN) metasurface achieve chirality modulation. The designed consists LN nanobar dimers, mode is excited by breaking in-plane out-of-plane symmetries structure, with circular dichroism (CD) value Q-factor reaching 0.92 1.24×104, respectively. Then, investigate second harmonic generation (SHG) device. conversion efficiency SHG under right circularly polarized pumping reaches 7.3×10−3, which more than three orders magnitude higher that left pumping. corresponding CD 0.99. addition, introducing phase change materials, active modulation chiroptical response. Our results provide crucial route high-quality sources.

Language: Английский

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Advancing hexagonal boron nitride single photon sources: A strategic roadmap for quantum applications

Materials Science in Semiconductor Processing, Journal Year: 2024, Volume and Issue: 185, P. 108932 - 108932

Published: Sept. 17, 2024

Language: Английский

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