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Micromachines
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Terahertz Metasurfaces: Advances and Applications
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Terahertz Metasurfaces: Advances and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 5359

Special Issue Editors

Prof. Dr. Yuancheng Fan

E-Mail Website
Guest Editor
School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
Interests: terahertz metasurface; terahertz technology; 2D optics; computational optics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jinhui Shi

E-Mail Website
Guest Editor
College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China
Interests: metamaterials; metasurfaces; terahertz wave; fiber-integrated devices
Special Issues, Collections and Topics in MDPI journals
Dr. Jing Lou

E-Mail Website
Guest Editor
Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
Interests: metasurfaces; ultrafast detection; terahertz modulation; terahertz biosensing

Special Issue Information

Dear Colleagues,

Residing in the frequency domain between the microwave and infrared regions, terahertz (THz) radiation demonstrates some peculiar characteristics, such as low energy, high resolution, and satisfactory penetration, which renders it a suitable technology for advanced research. The THz spectral region offers a higher available bandwidth that could meet the ever-growing demand for higher data transfer rates. Meanwhile, considering intramolecular and intermolecular vibrations, including hydrogen bonds, van der Waals forces, and nonbonding (hydrophobic) interactions occurring in the THz band, THz technologies naturally open up an additional method for the identification of biological substances such as amino acids, proteins, RNA, and DNA.

Important topics of growing interest include THz metasurfaces and nanophotonics, where we can see rapid development in the field of metal plasmonics and dielectric resonators. In this Special Issue, we encourage submissions from researchers who are working on THz metasurfaces or metamaterials and whose research covers topics on materials, devices, sources, and biosensing, or other advanced applications. We also encourage submissions that involve 2D materials science, such as studies on graphene-based THz modulators and nanostructured narrow-band-gap THz detectors.

Prof. Dr. Yuancheng Fan
Prof. Dr. Jinhui Shi
Dr. Jing Lou
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • terahertz metasurfaces
  • terahertz applications
  • terahertz plasmonics
  • sensing
  • bio-optics
  • detection

Published Papers (4 papers)

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Research

12 pages, 3806 KiB  
Article
Chiral Metasurface Multifocal Lens in the Terahertz Band Based on Deep Learning
by Jingjing Wang, Sixue Chen, Yihang Qiu, Xiaoying Chen, Jian Shen and Chaoyang Li
Micromachines 2023, 14(10), 1925; https://doi.org/10.3390/mi14101925 - 13 Oct 2023
Cited by 2 | Viewed by 1022
Abstract
Chiral metasurfaces have garnered significant interest as an emerging field of metamaterials, primarily due to their exceptional capability to manipulate phase distributions at interfaces. However, the on-demand design of chiral metasurface structures remains a challenging task. To address this challenge, this paper introduces [...] Read more.
Chiral metasurfaces have garnered significant interest as an emerging field of metamaterials, primarily due to their exceptional capability to manipulate phase distributions at interfaces. However, the on-demand design of chiral metasurface structures remains a challenging task. To address this challenge, this paper introduces a deep learning-based network model for rapid calculation of chiral metasurface structure parameters. The network achieves a mean absolute error (MAE) of 0.025 and enables the design of chiral metasurface structures with a circular dichroism (CD) of 0.41 at a frequency of 1.169 THz. By changing the phase of the chiral metasurface, it is possible to produce not only a monofocal lens but also a multifocal lens. Well-designed chiral metasurface lenses allow us to control the number and position of focal points of the light field. This chiral metasurface, designed using deep learning, demonstrates great multifocal focus characteristics and holds great potential for a wide range of applications in sensing and holography. Full article
(This article belongs to the Special Issue Terahertz Metasurfaces: Advances and Applications)
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12 pages, 10178 KiB  
Article
Full Complex-Amplitude Modulation of Surface Waves Based on Spin-Decoupled Metasurface
by Quan Li, Chao Wu, Yu Xie, Song Li, Hongqiang Li and Lijun Jin
Micromachines 2023, 14(8), 1511; https://doi.org/10.3390/mi14081511 - 27 Jul 2023
Viewed by 974
Abstract
This work proposes a method for surface wave (SW) coupling along with flexible complex amplitude modulation of its wavefront. The linearly polarized incident plane wave is coupled into the surface mode with complex wavefront by exploiting the spin-decouple nature of a reflective chiral [...] Read more.
This work proposes a method for surface wave (SW) coupling along with flexible complex amplitude modulation of its wavefront. The linearly polarized incident plane wave is coupled into the surface mode with complex wavefront by exploiting the spin-decouple nature of a reflective chiral meta-atom. As verification, two kinds of metasurface couplers are designed. The first kind contains two examples for SW airy beam generation with and without deflection under linearly polarized illumination, respectively. The second kind is a bi-functional device capable of SW focusing under left-handed circularly polarized illumination, and propagating wave deflection under right-handed circularly polarized illumination, respectively, to verify the fundamental spin-decoupled character. Simulated and experimental results are in good agreement. We believe that this method provides a flexible approach for complex SW applications in integrated optics, optical sensing, and other related fields. Full article
(This article belongs to the Special Issue Terahertz Metasurfaces: Advances and Applications)
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9 pages, 6724 KiB  
Article
Reconfigurable Terahertz Spatial Deflection Varifocal Metamirror
by Jianhui Fang, Renbin Zhong, Boli Xu, Huimin Zhang, Qian Wu, Benzheng Guo, Jianian Wang, Zhenhua Wu, Min Hu, Kaichun Zhang and Diwei Liu
Micromachines 2023, 14(7), 1313; https://doi.org/10.3390/mi14071313 - 27 Jun 2023
Cited by 2 | Viewed by 944
Abstract
A traditional optical lens usually has a fixed focus, and its focus controlling relies on a bulky lens component, which makes integration difficult. In this study, we propose a kind of terahertz spatial varifocal metamirror with a consistent metal–graphene unit structure whose focus [...] Read more.
A traditional optical lens usually has a fixed focus, and its focus controlling relies on a bulky lens component, which makes integration difficult. In this study, we propose a kind of terahertz spatial varifocal metamirror with a consistent metal–graphene unit structure whose focus can be flexibly adjusted. The focus deflection angle can be theoretically defined by superimposing certain encoded sequence on it according to Fourier convolution theorem. The configurable metamirror allows for the deflection of the focus position in space. The proposed configuration approach presents a design concept and offers potential advancements in the field of developing novel terahertz devices. Full article
(This article belongs to the Special Issue Terahertz Metasurfaces: Advances and Applications)
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11 pages, 7057 KiB  
Communication
A Double-Layer Dual-Polarized Huygens Metasurface and Its Meta-Lens Antenna Applications
by Shuo Cao, Jianhe Zhou, Ruxue Li and Chunhua Xue
Micromachines 2023, 14(6), 1139; https://doi.org/10.3390/mi14061139 - 28 May 2023
Viewed by 1925
Abstract
In this paper, a dual-polarized Huygens unit is proposed, which has a double-layer metallic pattern etched on both sides of one dielectric substrate. Induced magnetism enables the structure to support Huygens’ resonance, thus obtaining nearly complete available transmission phase coverage. By optimizing the [...] Read more.
In this paper, a dual-polarized Huygens unit is proposed, which has a double-layer metallic pattern etched on both sides of one dielectric substrate. Induced magnetism enables the structure to support Huygens’ resonance, thus obtaining nearly complete available transmission phase coverage. By optimizing the structural parameters, a better transmission performance can be achieved. When the Huygens metasurface was used for the design of a meta-lens, good radiation performance was exhibited, with a maximum gain of 31.15 dBi at 28 GHz, an aperture efficiency of 42.7% and a 3 dB gain bandwidth of 26.4 GHz to 30 GHz (12.86%). Due to its excellent radiation performance and very simple fabrication, this Huygens meta-lens has important applications in millimeter-wave communication systems. Full article
(This article belongs to the Special Issue Terahertz Metasurfaces: Advances and Applications)
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