Generating Third Harmonic Vacuum Ultraviolet Light with a TiO<sub>2</sub> Metasurface

Semmlinger, Michael; Zhang, Ming; Tseng, Ming Lun; Huang, Tzu Ting; Yang, Jian; Tsai, Din Ping; Nordlander, Peter; Halas, Naomi J.

doi:10.1021/acs.nanolett.9b03961

Cited by 88 publications

(62 citation statements)

References 69 publications

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“…TiO 2 is a transparent dielectric with a moderate refractive index in visible and near infrared regimes, and is widely used in metalens, [ 23 ] color printing, [ 24 ] and third harmonic generation. [ 25 ] Here, the TiO 2 nanopillar array over a large area was defined by solvent‐assisted nanoscale embossing (SANE) [ 26 ] together with RIE. Figure 1b depicts the fabrication procedure.…”

Section: Figurementioning

confidence: 99%

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Dong

Chen

Huang

et al. 2020

Advanced Optical Materials

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In this context, metal nanostructures with localized surface plasmon resonances (LSPRs) have attracted extensive attention. [2] LSPRs can be excited with wide-field normal-incidence illumination, and the optical setup for sensing can be simply constructed based on standard optical microscopes. [3] Periodic plasmonic nanostructures can offer additional advantages, [4] for example, a much narrower resonance linewidth (compared to LSPRs) that is beneficial for measuring a small spectral shift. However, the intense optical fields on the surface of plasmonic nanostructures can result in dissipative loss and lead to heating. Recently, periodic arrays of high-index dielectric nanostructures with collective resonances have been proposed as an alternative. [5-9] However, for periodic arrays of high-index dielectric nanostructures, even with broken inplane symmetry (so-called quasi-BIC; bound states in the continuum), [7,8] the bulk sensitivity (defined as the spectral shift upon the change in the bulk refractive index of the surrounding environment) is much lower than that of plasmonic arrays with the same lattice spacing. The collective lattice resonance stemming from the diffractive coupling in a periodic array of either metal [10-12] or high-index dielectric nanoparticles [13] requires a symmetric refractive-index environment between the bottom substrate and the upper cladding (e.g., aqueous buffers in sensing). [14-17] An asymmetric environment can inhibit long-range coupling between nanoparticles and suppress lattice resonances. In optical sensing, a periodic array of either metal or high-index dielectric nanoparticles is usually fabricated on a transparent substrate and exposed to solutions with different refractive indices. The index-mismatch between widely used quartz substrates (n ≈ 1.5) and aqueous buffers (n ≈ 1.33) can broaden the resonances and deteriorate the bulk sensitivity. [18] Although for sensing in aqueous buffers, one can find fluoropolymer (Cytop) with refractive index close to water to create a symmetric environment, [18,19] it is highly desirable to have a platform that can maintain high-quality resonances when subjected to a relatively large change in the bulk refractive index. (A symmetric refractive-index environment may not be required in a periodic structure with high-quality resonances of quasi-BIC type, for which the bulk sensitivity, however, is not high in the published literature. [7,8]) We recently reported that a hybrid system composed of low-index dielectric pillar arrays on a metal film can support This article reports refractometric sensing using two optical resonances of different types supported by TiO 2 nanopillar arrays on a gold film, which can be exposed to aqueous or organic environments. One lattice resonance, with enhanced electric fields extending into the surrounding environment, can maintain a quality factor Q > 200 when the bulk refractive index of the surrounding environment varies in a large range from 1.33 to 1.58. This lattice resonance exhibits not only sharp trans...

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Section: Figurementioning

confidence: 99%

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Dong

Chen

Huang

et al. 2020

Advanced Optical Materials

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“…A titanium dioxide metasurface enhancing third harmonic generation to produce ultraviolet light. Images: (a) and (b) are adapted from [9] Copyright © 2016 American Chemical Society, (c): [13] Copyright © 2018 American Chemical Society, (d) [14] Copyright © 2017 American Chemical Society and (e) [15] Copyright © 2019 American Chemical Society.…”

Section: Various Applications Based On Metasurfaces (A) Sem Image Ofmentioning

confidence: 99%

Nanomanipulation with Designer Thermoplasmonic Metasurface

Hong¹,

Yang²,

Ndukaife³

2020

Nanoplasmonics

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Plasmonic nanoantennas provide an efficient platform to confine electromagnetic energy to the deeply subwavelength scales. The resonant absorption of light by the plasmonic nanoantennas provides the means to engineer heat distribution at the micro and nanoscales. We present thermoplasmonic metasurfaces for on-chip trapping, dynamic manipulation and sensing of micro and nanoscale objects. This ability to rapidly concentrate objects on the surface of the metasurface holds promise to overcome the diffusion limit in surface-based optical biosensors. This platform could be applied for the trapping and label-free sensing of viruses, biological cells and extracellular vesicles such as exosomes.

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“…In addition to possessing these unique control capabilities, metasurfaces have the advantage of being flat, ultrathin, lightweight, and compact. Many applications have been developed based on photonics, for example, beam steering, [ 1,2 ] metaholography, [ 3–5 ] polarization control and analysis, [ 6–9 ] nonlinear generation, [ 10–13 ] lasers, [ 14 ] color displays, [ 15 ] tunable meta‐devices, [ 16,17 ] meta‐lenses, and other novel meta‐devices. This review focuses on the recent progress in meta‐lenses, and is organized as illustrated in Figure .…”

Section: Introductionmentioning

confidence: 99%

Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

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161

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A meta‐lens is an advanced flat optical device composed of artificial antennas. The amplitude, phase, and polarization of incident light can be engineered to satisfy the application requirements of meta‐lenses. Meta‐lenses can be designed to achieve a variety of functions, such as diffraction‐limited focusing, high focusing efficiency, and aberration correlation, which are useful in various application scenarios. This review focuses on the recent progress in meta‐lenses, from fundamentals to applications. The present challenges in this domain are summarized and future prospects are offered. The primary aim of this review is to provide the reader with a comprehensive understanding of meta‐lenses and potential inspiration for designing high‐performance meta‐lenses for feasible applications.

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Generating Third Harmonic Vacuum Ultraviolet Light with a TiO₂ Metasurface

Cited by 88 publications

References 69 publications

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Nanomanipulation with Designer Thermoplasmonic Metasurface

Principles, Functions, and Applications of Optical Meta‐Lens

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Generating Third Harmonic Vacuum Ultraviolet Light with a TiO2 Metasurface

Cited by 88 publications

References 69 publications

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Low‐Index‐Contrast Dielectric Lattices on Metal for Refractometric Sensing

Nanomanipulation with Designer Thermoplasmonic Metasurface

Principles, Functions, and Applications of Optical Meta‐Lens

Contact Info

Product

Resources

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Generating Third Harmonic Vacuum Ultraviolet Light with a TiO₂ Metasurface