Special Issue "Active/Reconfigurable Metasurfaces"

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 30 November 2022 | Viewed by 5257

Special Issue Editor

Dr. Antonio Ferraro
E-Mail Website
Guest Editor
Physics Department, University of Calabria, I-87036 Rende (CS), Italy
Interests: metamaterials device fabrication and characterization; optical nanomaterials; manufacture of liquid crystal tuneable plasmonic and metamaterials devices; fabrication and spectroscopic characterization of components for Terahertz (THz) applications

Special Issue Information

Dear Colleagues,

Recently, the interest in planar devices has growing at fast pace replacing bulky and thick components in all the electromagnetic spectrum, from optics to microwave passing from terahertz electromagnetic wave.

This interest arises from the outstanding properties of metasurfaces which are ultrathin planar materials composed of subwavelength dielectric or metallic elements. To realize novel breakthrough applications and systems, however, it is necessary to actively control and reconfigure the properties of metasurfaces by means of materials properties can be modify under external stimuli as electric, thermal, magnetic to name a few.

In this scenario, the proposed Special Issue aims to connect researchers with expertise in different technological area focusing attention on recent theoretical and experimental results.

This special issue addresses the following main topics:

-    General aspect of metasurfaces

-    Liquid Crystal based metasurfaces

-    Flexible metasurfaces

-    Phase change material based metasurfaces

-    UV-Vis-NIR Metasurfaces

-    Terahertz Metasurfaces

-    Microwave Metasurfaces

-    Semiconductor metasurfaces

-    0D-1D-2D materials metasurfaces

-    Plasmonic and Dielectric metasurfaces

Dr. Antonio Ferraro
Guest Editor

Manuscript Submission Information

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Published Papers (4 papers)

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Research

Article
Research of Gate-Tunable Phase Modulation Metasurfaces Based on Epsilon-Near-Zero Property of Indium-Tin-Oxide
Photonics 2022, 9(5), 323; https://doi.org/10.3390/photonics9050323 - 09 May 2022
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Abstract
In this paper, we proposed a reflection phase electrically tunable metasurface composed of an Au/Al2O3/ITO/Au grating structure. This antenna array can achieve a broad phase shift continuously and smoothly from 0° to 320° with a 5.85 V applied voltage [...] Read more.
In this paper, we proposed a reflection phase electrically tunable metasurface composed of an Au/Al2O3/ITO/Au grating structure. This antenna array can achieve a broad phase shift continuously and smoothly from 0° to 320° with a 5.85 V applied voltage bias. Tunability arises from field-effect modulation of the carrier concentrations or accumulation layer at the Al2O3/ITO interface, which excites electric and magnetic resonances in the epsilon-near-zero region. To make the reflected phase tuning range as wide as possible, some of the intensity of the reflected light is lost due to the excited surface plasmon effect. Simulation results show that the effect of optimal phase modulation can be realized at a wavelength range of 1550 nm by modulating the carrier concentration in our work. Additionally, we utilized an identical 13-unit array metasurface to demonstrate its application to the beam steering function. This active optical metasurface can enable a new realm of applications in ultrathin integrated photonic circuits. Full article
(This article belongs to the Special Issue Active/Reconfigurable Metasurfaces)
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Communication
All-Dielectric Metasurface Based on Complementary Split-Ring Resonators for Refractive Index Sensing
Photonics 2022, 9(3), 130; https://doi.org/10.3390/photonics9030130 - 25 Feb 2022
Viewed by 733
Abstract
Thanks to their lower losses and sharper resonances compared to their metallic counterparts, all-dielectric metasurfaces are attracting a quickly growing research interest. The application of such metasurfaces in the field of refractive index sensing is extremely attractive, especially due to the expected high [...] Read more.
Thanks to their lower losses and sharper resonances compared to their metallic counterparts, all-dielectric metasurfaces are attracting a quickly growing research interest. The application of such metasurfaces in the field of refractive index sensing is extremely attractive, especially due to the expected high performance and the simplicity of the sensing element excitation and readout. Herein, we report on an all-dielectric silicon metasurface based on complementary split-ring resonators (CSRRs) optimized for refractive index sensing. A quasi-bound state in the continuum (quasi-BIC) with an ultra-high quality factor can be excited in the near-infrared (NIR) window by violating the structure symmetry. By using the three-dimensional finite element method (3D-FEM), a refractive index sensor for biomedical applications with an ultra-high figure of merit (FoM > 100,000 RIU−1) has been designed, exploiting the quasi-BIC resonance. The proposed design strategy opens new avenues for developing flat biochemical sensors that are accurate and responsive in real time. Full article
(This article belongs to the Special Issue Active/Reconfigurable Metasurfaces)
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Communication
LIDAR and Beam Steering Tailored by Neuromorphic Metasurfaces Dipped in a Tunable Surrounding Medium
Photonics 2021, 8(3), 65; https://doi.org/10.3390/photonics8030065 - 26 Feb 2021
Cited by 8 | Viewed by 1429
Abstract
The control of amplitude, losses and deflection of light with elements of an optical array is of paramount importance for realizing dynamic beam steering for light detection and ranging applications (LIDAR). In this paper, we propose an optical beam steering device, operating at [...] Read more.
The control of amplitude, losses and deflection of light with elements of an optical array is of paramount importance for realizing dynamic beam steering for light detection and ranging applications (LIDAR). In this paper, we propose an optical beam steering device, operating at a wavelength of 1550 nm, based on high index material as molybdenum disulfide (MoS2) where the direction of the light is actively controlled by means of liquid crystal. The metasurface have been designed by a deep machine learning algorithm jointed with an optimizer in order to obtain univocal optical responses. The achieved numerical results represent a promising way for the realization of novel LIDAR for future applications with increase control and precision. Full article
(This article belongs to the Special Issue Active/Reconfigurable Metasurfaces)
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Communication
Switchable Metasurface with VO2 Thin Film at Visible Light by Changing Temperature
Photonics 2021, 8(2), 57; https://doi.org/10.3390/photonics8020057 - 18 Feb 2021
Cited by 4 | Viewed by 1834
Abstract
We numerically demonstrated switchable metasurfaces using a phase change material, VO2 by temperature change. The Pancharatnam–Berry metasurface was realized by using an array of Au nanorods on top of a thin VO2 film above an Au film, where the optical property [...] Read more.
We numerically demonstrated switchable metasurfaces using a phase change material, VO2 by temperature change. The Pancharatnam–Berry metasurface was realized by using an array of Au nanorods on top of a thin VO2 film above an Au film, where the optical property of the VO2 film is switched from the insulator phase at low temperature to the metal phase at high temperature. At the optimal structure, polarization conversion efficiency of the normal incident light is about 75% at low temperature while that is less than 0.5% at high temperature in the visible region (λ 700 nm). Various functionalities of switchable metasurfaces were demonstrated such as polarization conversion, beam steering, Fourier hologram, and Fresnel hologram. The thin-VO2-film-based switchable metasurface can be a good candidate for various switchable metasurface devices, for example, temperature dependent optical sensors, beamforming antennas, and display. Full article
(This article belongs to the Special Issue Active/Reconfigurable Metasurfaces)
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