We report the excitation of optical anapole states at ultraviolet (UV) wavelengths. Numerical simulations indicate that TiO nano-rectangles with varying length-to-width ratios can support such modes within the 350-380 nm range. We further propose a two-dimensional periodic arrangement of these nano-rectangles deposited atop a fused silica substrate. Understanding and manipulating optical anapole states in the ultraviolet spectrum is crucial for advancing next-generation photonic devices and enhancing nonlinear optical processes, such as generation of highly energetic vacuum ultraviolet light through third-harmonic generation.
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http://dx.doi.org/10.1364/OL.536925 | DOI Listing |
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December 2024
Department of Electrical and Electronic Engineering, Engineering Building A, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Plasmonic catalysis, whereby either an optically resonating metal couples to a catalytic material or a catalytic metal particle achieves optical resonance, has been a mainstay of photo-catalysis research for the past few decades. However, a new field of metal-dielectric metamaterials, including plasmonic metamaterials, is emerging as the next frontier in catalysis research. With new optical behaviors that can be achieved by sub-wavelength structures, in either periodic or semi-periodic arrangements, metamaterials can overcome some of the limitations of conventional plasmonic catalysis.
View Article and Find Full Text PDFWe report the excitation of optical anapole states at ultraviolet (UV) wavelengths. Numerical simulations indicate that TiO nano-rectangles with varying length-to-width ratios can support such modes within the 350-380 nm range. We further propose a two-dimensional periodic arrangement of these nano-rectangles deposited atop a fused silica substrate.
View Article and Find Full Text PDFNanophotonics
September 2024
Institute of Modern Optics, Nankai University, Tianjin, China.
Multi-resonant metasurfaces are of great significance in the applications of multi-band nanophotonics. Here, we propose a novel metasurface design scheme for simultaneously supporting quasi-bound states in continuum (QBIC) and other resonant modes, in which QBIC resonance is generated by mirror or rotational symmetry breaking in oligomers while other resonant modes can be simultaneously excited by rationally designing the shapes of meta-atoms within oligomers. As an example, the simultaneous excitation of QBIC and anapole modes are demonstrated in a dimer metasurface composed of asymmetric dumbbell-shaped apertures.
View Article and Find Full Text PDFPrecise optical control at the nanoscale is crucial for advancing photonic devices and sensing technologies. Herein, we theoretically introduce what we believe to be a novel approach for nano-optical manipulation, employing Au core-Si shell nanodisks interacting with tightly focused cylindrical vector beams to achieve electric and magnetic anapole states. Our investigations unveil that the interplay between individual nanodisks and radially polarized beams (RPBs) located in the center of RPBs yields a position-dependent electric anapole state.
View Article and Find Full Text PDFAdv Mater
November 2024
Department of Photonics, National Cheng Kung University, Tainan, 70101, Taiwan.
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