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Dispersion Engineering: Methodologies for On-Demand Dispersion Engineering of Waves in Metasurfaces (Advanced Optical Materials 14/2019)

  • First Published: 18 July 2019
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The dispersion is one critical property of waves. In article number 1801376, Mingbo Pu, Xiangang Luo and co-workers give a summary of the methodologies used for the on-demand dispersion engineering of waves in metasurfaces, which may result in exciting applications with performances beyond traditional limitations. It is found that most metasurfaces could be continuously transformed from simple thin films, thus the methodologies are universal and may be applied in many different circumstances.

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Twisted Materials: A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light (Advanced Optical Materials 14/2019)

  • First Published: 18 July 2019
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Light possessing orbital angular momentum and an associated phase singularity, that is an optical vortex, twists a variety of materials, including silicon, azo-polymer, and even liquid-phase resins, to form various helically structured materials. Such light-induced helical structured materials, as reviewed by Takashige Omatsu and co-workers in article number 1801672, will potentially lead to advanced photonic devices, for instance, metamaterials for ultra-sensitive detection and reactions for chiral chemical composites.

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Hyperbolic Metamaterials: Hyperbolic Metamaterials and Metasurfaces: Fundamentals and Applications (Advanced Optical Materials 14/2019)

  • First Published: 18 July 2019
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Hyperbolic media are very attractive for the application of light field manipulation due to their unique optical properties. In article number 1801616, Ting Xu and coworkers comprehensively discuss the working principle, realization and practical applications of two types of hyperbolic media, including three-dimensional bulk hyperbolic metamaterials and two-dimensional planar hyperbolic metasurfaces.

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Masthead: (Advanced Optical Materials 14/2019)

  • First Published: 18 July 2019

Editorial

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Metamaterials and Metasurfaces

  • First Published: 18 July 2019

Reviews

Optical Anapoles: Concepts and Applications

  • First Published: 21 January 2019
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This review uncovers the physics of multimode interference and multipolar interplay in subwavelength photonics with an intriguing example of “optical anapoles”—specific optical states manifested as far-field scattering suppression accompanied with considerable local field enhancement. The anapole effect underlies a plethora of recent experimental observations and perspective applications in nanophotonics and metaoptics.

Methodologies for On-Demand Dispersion Engineering of Waves in Metasurfaces

  • First Published: 05 March 2019
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Dispersion engineering of waves on structured surfaces is critical to construct functional metasurface devices. This review discusses in detail the background, principles, and methodologies of spectral and spatial dispersion engineering. Its applications in super-resolution imaging and nanolithography, achromatic and multiwavelength wavefront shaping, broadband absorption, and polarization conversion are investigated within a universal framework.

Empowered Layer Effects and Prominent Properties in Few-Layer Metasurfaces

  • First Published: 20 March 2019
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Few-layer metasurfaces have enormous degrees of freedom and abundant layer effects to design novel optical devices and to achieve high-efficiency applications. Here, the authors concentrate on the basic layer effects and distinctive properties in few-layer metasurfaces, and review some prominent applications proposed in recent years.

Hyperbolic Metamaterials and Metasurfaces: Fundamentals and Applications

  • First Published: 16 April 2019
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Hyperbolic media are very attractive for the application of light field manipulation due to their unique optical properties. Here, the working principle, realization, and practical applications of two types of hyperbolic media are comprehensively discussed, including 3D bulk hyperbolic metamaterials and 2D planar hyperbolic metasurfaces.

Plasmonic Lithography: Recent Progress

  • First Published: 02 May 2019
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Plasmonic lithography is reviewed in this article with particular attention to the achievement of nanometer-scale, high aspect ratio structures for nanophotonics, metasurface fabrication, and other applications. Limitations and bottlenecks for progress are discussed, particularly in relation to the sensitivity to roughness on plasmonic material surfaces and the near-field requirements that can limit compatibility with low-defect device and circuit manufacturing.

Plasmonic Near-Complete Optical Absorption and Its Applications

  • First Published: 02 May 2019
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Near-complete absorption of light has the potential to underpin advances in photodetection, advanced chemistry, coloration of materials, and energy. This article reports recent progress in the use of plasmonic metasurfaces and other thin film structures exhibiting strong absorption in various regions of the electromagnetic spectrum. Proof-of-principle demonstrations and applications of these devices are discussed.

Manipulating Cherenkov Radiation and Smith–Purcell Radiation by Artificial Structures

  • First Published: 01 April 2019
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Artificially engineered materials, such as metamaterials and metasurfaces, offer new degrees of freedom to tailor the emission of charged particles in an unprecedented manner. This review summarizes the recent progress of manipulating Cherenkov radiation and Smith–Purcell radiation by artificial structures, discusses the relevant applications, and provides an outlook for this emerging research area.

A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light

  • First Published: 19 June 2019
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Irradiation with light possessing orbital angular momentum and an associated phase singularity, that is an optical vortex, twists a variety of materials. Such light-induced helical-structured materials will potentially lead to advanced photonic devices, for instance, metamaterials for ultrasensitive detection and reactions for chiral chemical composites.

Light Emission by a Thermalized Ensemble of Emitters Coupled to a Resonant Structure

  • First Published: 02 May 2019
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Resonators such as cavities or plasmonic antennas are used to control light emission by single emitters. Here, light emission by ensembles of thermalized emitters coupled to resonators are reviewed and several features that cannot be understood using the single emitter framework are highlighted. How the fluctuational electrodynamics formalism can be used to analyze experimental results is discussed.

Dynamic Metasurfaces Using Phase-Change Chalcogenides

  • First Published: 05 March 2019
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Phase-change chalcogenides, a typical kind of phase-change materials (PCMs), are integrated into metasurfaces to explore innovative configurations enabling global and local amplitude/phase modulation with remarkable tunability and reconfigurability due to the dramatic optical contrasts available in PCMs along with their high chemical and long-term stability and high switching speeds.

Optical Metasurfaces: Evolving from Passive to Adaptive

  • First Published: 21 May 2019
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Adaptive metasurfaces would enable a dynamic manipulation of the propagation of light to create functionalities such as beam scanning, zoom lensing, or dynamic holography. In this article, the ongoing evolution from passive to adaptive optical metasurfaces with dynamically changeable functionalities after their fabrication is reviewed.

Recent Progress in Active Optical Metasurfaces

  • First Published: 29 April 2019
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Optical metasurfaces provide unprecedented flexibility in tailoring light–matter interactions on subwavelength scales, while their dynamic responses are critical for the development of practical metadevices. Here the authors review the recent advances in active optical metasurfaces, highlighting a group of active materials, including phase change materials, indium tin oxide, graphene, liquid crystals, semiconductors, etc., and also other emergent approaches.

Semiconductor Thin Film Based Metasurfaces and Metamaterials for Photovoltaic and Photoelectrochemical Water Splitting Applications

  • First Published: 27 May 2019
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Thinning the semiconductor active layer thickness down to a level comparable with carriers' diffusion length, while keeping its absorption high, is an ultimate goal to boost the performance of optoelectronic devices. This review summarizes the recent advancements in semiconductor thin film based metasurfaces and metamaterials for photovoltaic and photoelectrochemical water splitting applications.

Communications

Total Reflection Metasurface with Pure Modulated Signal

  • First Published: 09 December 2018
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The transfer efficiency of the metasurfaces cannot match the conventional optical components, which greatly limits the functionality. A new total reflection metasurface is proposed. It can eliminate the primary source of noise from unmodulated light, improve the efficiency by 633% theoretically, insensitive to polarizations, and “plug-to-use” as ultrathin components without extra bulky component.

Second-Harmonic Generation by 3D Laminate Metacrystals

  • First Published: 15 March 2019
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3D dielectric woodpile photonic crystals, which are conformally coated with locally noninversion-symmetric dielectric laminate metamaterials, are discussed. Experimentally these “3D laminate metacrystals” show resonant enhancements of second-harmonic generation of light of up to two orders of magnitude with respect to the same laminate metamaterial on a glass substrate. The salient experimental features are reproduced numerically.

Full Papers

Compact Aberration-Corrected Spectrometers in the Visible Using Dispersion-Tailored Metasurfaces

  • First Published: 09 December 2018
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Optical spectroscopy is an essential tool used in many areas such as food monitoring and medical diagnostics. However, spectrometers typically face a trade-off between their spectral resolution, working wavelength range, and overall device size due to optical aberrations. Here a highly compact, aberration-corrected spectrometer with nanometer resolution across most of the visible spectrum using off-axis metalenses is presented.

Open Access

An Etching-Free Approach Toward Large-Scale Light-Emitting Metasurfaces

  • First Published: 08 April 2019
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Nanoimprinting lithography is used to realize centimeter-scale semiconductor-based UV metalenses. Avoiding a dry-etching process to preserve the excellent light-emission properties of nanoresonators, nanopatterning is realized using selective area sublimation of GaN. These results represent significant steps toward the realization of active metasurfaces.

Magneto-Optical Metamaterials: Nonreciprocal Transmission and Faraday Effect Enhancement

  • First Published: 18 March 2019
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A new type of a hyperbolic magneto-optical metamaterial based on Au–Ni nanorod arrays is developed. The metamaterial exhibits the enhanced magneto-optical response with large rotation of a polarization plane and nonreciprocal light transmission. The response of the metamaterial is drastically enhanced with respect to bulk ferromagnetic media due to an interplay between strong anisotropy and magnetic-field induced polarization rotation.

Arbitrary Polarization Conversion with a Photonic Crystal Slab

  • First Published: 16 January 2019
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A simple photonic crystal slab provides a powerful mechanism for the control of the polarization of light. For a given incident light with any fixed polarization, one can generate arbitrary polarization in the reflected light, by varying the direction of the incident light. Hence the polarization states of the reflected light can cover the entire Poincaré sphere.

Dielectric Broadband Metasurfaces for Fiber Mode-Multiplexed Communications

  • First Published: 12 April 2019
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All-dielectric metasurfaces with broadband response covering major optical communication wavelength bands are suggested for subwavelength-thick spatial-mode multiplexers. The conversion of LP01 polarization-multiplexed modes to higher-order modes is demonstrated with the total bit-rate of 13.2 Tb s−1, with multiplexed data being transmitted over a multimode fiber. The results reveal the potential application of the metadevice mode multiplexers for efficient space-division multiplexed systems.