A Review on Metasurface: From Principle to Smart Metadevices

Frontiers in Physics, Journal Year: 2021, Volume and Issue: 8

Published: Jan. 29, 2021

Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields incident electromagnetic waves, exhibiting unprecedented properties which most typical within context domain. However, practical application metamaterials is found challenging due high losses, strong dispersion associated with resonant responses, difficulty in fabrication nanoscale 3D structures. The optical metasurface termed as 2D inherent all also provide a solution limitation conventional metamaterials. Over past few years, metasurfaces; have been employed for design elements systems abilities surpass performance diffractive elements. Metasurfaces can be fabricated using standard lithography nanoimprinting methods, easier campared counterpart 3 days In this review article, progress research on metasurfaces illustrated. Concepts anomalous reflection refraction, applications Pancharatanm-Berry Phase, Huygens discussed. development soft opens up new dimension zone conformal or wearable photonics. has discussed review. Meta-devices being developed principle shaping wavefronts elucidated Furthermore, it established novel modulated by change mechanical, electrical, stimuli leads dynamic metasurface. Research thrusts over area tunable reviewed article. recent year, fibers coagulated devices advantages both domains. lab-on fiber-based paper. Finally, trends, challenges, future scope work summarized conclusion part article.‬‬‬‬‬‬‬

Language: Английский

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Optical meta-waveguides for integrated photonics and beyond

Light Science & Applications, Journal Year: 2021, Volume and Issue: 10(1)

Published: Nov. 22, 2021

Abstract The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic chip. integration subwavelength-structured metasurfaces and metamaterials the canonical building block waveguides is gradually reshaping landscape integrated circuits, giving rise to numerous meta-waveguides with unprecedented strength in controlling guided electromagnetic waves. Here, we review recent advances meta-structured that synergize various functional subwavelength architectures diverse waveguide platforms, such as dielectric or plasmonic fibers. Foundational results representative applications are comprehensively summarized. Brief physical models explicit design tutorials, either intuition-based methods computer algorithms-based inverse designs, cataloged well. We highlight how meta-optics can infuse new degrees freedom waveguide-based devices systems, by enhancing light-matter interaction drastically boost device performance, offering versatile designer media for manipulating light nanoscale enable novel functionalities. further discuss current challenges outline emerging opportunities this vibrant field biomedical sensing, artificial intelligence beyond.

Language: Английский

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Tunable structured light with flat optics

Science, Journal Year: 2022, Volume and Issue: 376(6591)

Published: April 21, 2022

Flat optics has emerged as a key player in the area of structured light and its applications, owing to subwavelength resolution, ease integration, compact footprint. Although first generation revolutionized conventional lenses enabled anomalous refraction, new classes meta-optics can now shape dark features an optical field with unprecedented level complexity multifunctionality. Here, we review these efforts focus on metasurfaces that use different properties input light—angle incidence direction, polarization, phase distribution, wavelength, nonlinear behavior—as knobs for tuning output response. We discuss ongoing advances this well future challenges prospects. These recent developments indicate optically tunable flat is poised advance adaptive camera systems, microscopes, holograms, portable wearable devices may suggest possibilities communications sensing.

Language: Английский

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High-efficiency broadband achromatic metalens for near-IR biological imaging window

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Sept. 21, 2021

Over the past years, broadband achromatic metalenses have been intensively studied due to their great potential for applications in consumer and industry products. Even though significant progress has made, efficiency of technologically relevant silicon is limited by intrinsic material loss above bandgap. In turn, recently proposed metalens utilizing transparent, high-index materials such as titanium dioxide restricted small thickness showed relatively low focusing at longer wavelengths. Consequently, metalens-based optical imaging biological transparency window so far severely limited. Herein, we experimentally demonstrate a polarization-insensitive, near-infrared imaging. A large-scale fabrication technology developed produce nanopillars with record-high aspect ratios featuring pillar heights 1.5 µm ~90° vertical sidewalls. The demonstrated exhibits dramatically increased group delay range, spectral range achromatism substantially extended wavelength 650-1000 nm an average 77.1%-88.5% numerical aperture 0.24-0.1. This research paves solid step towards practical flat photonics.

Language: Английский

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Dielectric metalens for miniaturized imaging systems: progress and challenges

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: June 28, 2022

Abstract Lightweight, miniaturized optical imaging systems are vastly anticipated in these fields of aerospace exploration, industrial vision, consumer electronics, and medical imaging. However, conventional techniques intricate to downscale as refractive lenses mostly rely on phase accumulation. Metalens, composed subwavelength nanostructures that locally control light waves, offers a disruptive path for small-scale systems. Recent advances the design nanofabrication dielectric metalenses have led some high-performance practical This review outlines exciting developments aforementioned area whilst highlighting challenges using replace optics miniature After brief introduction fundamental physics metalenses, progress terms typical performances introduced. The supplementary discussion common hindering further development is also presented, including limitations methods, difficulties scaling up, device integration. Furthermore, potential approaches address existing deliberated.

Language: Английский

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Meta-optics achieves RGB-achromatic focusing for virtual reality

Science Advances, Journal Year: 2021, Volume and Issue: 7(5)

Published: Jan. 27, 2021

A large dispersion-engineered metalens achieves multicolor focusing and opens a path to future virtual reality platform.

Language: Английский

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Roadmap of Terahertz Imaging 2021

Sensors, Journal Year: 2021, Volume and Issue: 21(12), P. 4092 - 4092

Published: June 14, 2021

In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to optimization and miniaturization of THz systems. Such systems entail enhanced functionality, reduced power consumption, increased convenience, thus being geared toward implementation real operational conditions. The article will touch upon advanced solid-state-based systems, including room temperature sensors arrays, as well their on-chip integration diffractive optical components. We cover current-state compact emission sources, both optolectronic electrically driven; emphasis is attributed beam-forming role imaging, holography spatial filtering, nano-imaging, computational imaging. A number techniques, such light-field homodyne spectroscopy, phase sensitive spectrometry, modulated continuous wave frequency combs, passive use artificial intelligence data processing optics development, be reviewed. This presents a structured snapshot current 2021 provides an opinion contemporary scientific technological challenges field, extrapolations possible further evolution

Language: Английский

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Metasurfaces for biomedical applications: imaging and sensing from a nanophotonics perspective

Nanophotonics, Journal Year: 2020, Volume and Issue: 10(1), P. 259 - 293

Published: Sept. 7, 2020

Abstract Metasurface is a recently developed nanophotonics concept to manipulate the properties of light by replacing conventional bulky optical components with ultrathin (more than 10 4 times thinner) flat components. Since first demonstration metasurfaces in 2011, they have attracted tremendous interest consumer optics and electronics industries. Recently, metasurface-empowered novel bioimaging biosensing tools emerged been reported. Given recent advances biomedical engineering, this review article covers state art for technology provides comprehensive interdisciplinary perspective on field. The topics that we covered include chiral imaging, endoscopic coherence tomography, fluorescent super-resolution magnetic resonance quantitative phase sensing antibodies, proteins, DNAs, cells, cancer biomarkers. Future directions are discussed twofold: application-specific bioinspired metasurface devices. Perspectives challenges opportunities metasurfaces, biophotonics, translational devices also provided. objective inform stimulate research: firstly, introducing community; secondly assisting community understand needs realize medical fields. In addition, two knowledge boxes describing design process lens performance matrix biosensor, which serve as “crash-course” introduction those new both

Language: Английский

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Metasurface-Driven Optically Variable Devices

Chemical Reviews, Journal Year: 2021, Volume and Issue: 121(21), P. 13013 - 13050

Published: Sept. 7, 2021

Optically variable devices (OVDs) are in tremendous demand as optical indicators against the increasing threat of counterfeiting. Conventional OVDs exposed to danger fraudulent replication with advances printing technology and widespread copying methods security features. Metasurfaces, two-dimensional arrays subwavelength structures known meta-atoms, have been nominated a candidate for new generation they exhibit exceptional behaviors that can provide more robust solution anti-counterfeiting. Unlike conventional OVDs, metasurface-driven (mOVDs) contain multiple responses single device, making them difficult reverse engineered. Well-known examples mOVDs include ultrahigh-resolution structural color printing, various types holography, polarization encoding. In this review, we discuss mOVDs. The fundamentals plasmonic dielectric metasurfaces presented explain how be manipulated. Then, monofunctional, tunable, multifunctional discussed. We follow up discussion fabrication needed realize these mOVDs, classified into prototyping manufacturing techniques. Finally, an outlook classification respect their capacity level. believe newly proposed concept may bring about era anticounterfeit leveraging novel concepts nano-optics nanotechnology.

Language: Английский

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Tunable metasurfaces towards versatile metalenses and metaholograms: a review

Advanced Photonics, Journal Year: 2022, Volume and Issue: 4(02)

Published: March 7, 2022

Metasurfaces have attracted great attention due to their ability manipulate the phase, amplitude, and polarization of light in a compact form. Tunable metasurfaces been investigated recently through integration with mechanically moving components electrically tunable elements. Two interesting applications, particular, are vary focal point metalenses switch between holographic images. We present recent progress on focused metaholograms, including basic working principles, advantages, disadvantages each mechanism. classify stimuli based source electrical bias, as well others such thermal mechanical modulation. conclude by summarizing providing our perspectives for further development metasurfaces.

Language: Английский

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