Dual-channel quantum meta-hologram for display

Fan, Yubin; Liang, Hong; Wang, Yuhan; Chen, Shufan; Lai, Fangxing; Ku Chen, Mu; Xiao, Shumin; Li, Jensen; Tsai, Din Ping

doi:10.1117/1.apn.3.1.016011

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…Recently, studies in metasurfaces − have shown that integrated-resonant units (IRUs) present a promising solution to overcome the existing bottleneck in field enhancement. − By integrating various resonance modes within one supercell, the IRU not only leverages the intrinsic modes for field enhancement but also promotes interactions among these modes, significantly amplifying the electric field. Furthermore, IRU is capable of engaging nonlocal resonance modes characterized by a collective response from multiple adjacent units .…”

Section: Introductionmentioning

confidence: 99%

Bound States in the Continuum for Hot Electron Generation in Integrated-Resonant Metasurfaces

Lin,

Yao,

Wang

et al. 2024

J. Phys. Chem. C

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Hydrogen, as a type of sustainable energy, has the potential to facilitate the achievement of carbon neutrality by replacing fossil fuels. Conventional plasmonic metal nanostructures as efficient photocatalysts have been employed to generate hot electrons, thus further facilitating hydrogen production. However, such structures only contain a single resonance mode, which restricts field enhancement and further limits the hot electron generation rate. In this work, we introduce a novel plasmonic integrated-resonant unit (IRU) that combines local and nonlocal modes and can excite a strong interaction between the modes to generate a quasi-bound state in the continuum (quasi-BIC) regime for enhancing the electric field. As a result, we achieved a maximum field enhancement factor of 168.5 at the excitation wavelength of 734 nm under period P = 750 nm. Correspondingly, the generation rate of hot electrons can exceed 6 × 10 19 s −1 , which is 2 orders of magnitude greater than that of the structure without IRU property. This research provides a strategic framework for the development of plasmonic nanostructures to enhance hot electron generation efficiency and photocatalytic activity, which is pivotal for the advancement of clean energy and the realization of a decarbonized future.

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Section: Introductionmentioning

confidence: 99%

Bound States in the Continuum for Hot Electron Generation in Integrated-Resonant Metasurfaces

Lin,

Yao,

Wang

et al. 2024

J. Phys. Chem. C

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Meta-lens based on multi-level phase-change

Zhang,

Yao,

Tsai

2024

Journal of Applied Physics

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Given the significant progress in the field of meta-lenses over the past decade, tunable meta-lenses have garnered considerable attention for their flexible functionality. Various mechanisms have been developed to realize high-performance tunable meta-lenses, including electricity, strain, thermal effects, and materials, such as phase-change materials and liquid crystals. However, currently, most tunable meta-lenses are limited to discrete focal lengths, typically only involving two spots, and the potential of phase-change materials, such as Ge2Sb2Te5, Sb2S3, etc., has not yet been fully exploited. Here, we propose a design approach to achieve tunable meta-lenses with continuous focal length manipulation working at 1550 nm based on phase-change materials (Sb2S3). The focal length can be gradually tuned from 35 to 55 μm during the conversion process between crystalline and amorphous states. The meta-atoms are rectangular shapes of different sizes and orientations to provide certain phase compensations from propagation and Pancharatnam–Berry phases, respectively. The tunable Airy beam, Bessel beam, and deflection of the meta-lens focal spot are also demonstrated to show the universality of the proposed design. This endeavor will lay the groundwork for the design of tunable meta-devices, thereby streamlining their integration into infrared systems.

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Nonlocal metasurface for dark-field edge emission

Yao,

Hsu,

Liang

et al. 2024

Sci. Adv.

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Nonlocal effects originating from interactions between neighboring meta-atoms introduce additional degrees of freedom for peculiar characteristics of metadevices, such as enhancement, selectivity, and spatial modulation. However, they are generally difficult to manipulate because of the collective responses of multiple meta-atoms. Here, we experimentally demonstrate the nonlocal metasurface to realize the spatial modulation of dark-field emission. Plasmonic asymmetric split rings (ASRs) are designed to simultaneously excite local dipole resonance and nonlocal quasi-bound states in the continuum and spatially extended modes. With one type of unit, nonlocal effects are tailored by varying array periods. ASRs at the metasurface’s edge lack sufficient interactions, resulting in stronger dark-field scattering and thus edge emission properties of the metasurface. Pixel-level spatial control is demonstrated by simply erasing some units, providing more flexibility than conventional local metasurfaces. This work paves the way for manipulating nonlocal effects and facilitates applications in optical trapping and sorting at the nanoscale.

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Dual-channel quantum meta-hologram for display

Cited by 4 publications

References 35 publications

Bound States in the Continuum for Hot Electron Generation in Integrated-Resonant Metasurfaces

Bound States in the Continuum for Hot Electron Generation in Integrated-Resonant Metasurfaces

Meta-lens based on multi-level phase-change

Nonlocal metasurface for dark-field edge emission

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