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Micromachines
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Terahertz and Infrared Metamaterial Devices, 2nd Edition
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Terahertz and Infrared Metamaterial Devices, 2nd Edition

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

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 6891

Special Issue Editors

Dr. Xiaoguang Zhao

E-Mail Website
Guest Editor
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Interests: metamaterials and metasurfaces; terahertz devices; microelectromechanical system; microsystems
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Rui You

E-Mail Website
Guest Editor
School of Instrument Science and Opto-Electronics Engineering, Beijing Information Science & Technology University, Beijing 100192, China
Interests: metamaterials and metasurfaces; microelectromechanical systems; terahertz devices; chemical and biological sensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metamaterials and their 2D counterparts (i.e., metasurfaces) consist of subwavelength metallic or dielectric unit cells that enable the on-demand tailoring of the effective medium properties in the full range of the electromagnetic spectrum. With the design of metamaterials, interactions of light and matter are engineered to achieve various functions, including but not limited to anomalous refraction, perfect absorption, super-lensing, arbitrary polarization and angular orbital momentum control, as well as self-adaptive response. The emerging metamaterials foster the development of optical components and devices from radiofrequencies to visible wavelengths, especially in the terahertz and infrared regimes. Terahertz and infrared metamaterials give rise to functional devices such as detectors, imagers, ultrathin flat lenses, and polarizers, among others. More intriguingly, metamaterials can be dynamically tuned to achieve reprogramming and reconfigurable devices, including spatial light modulators, beam manipulation, and phase modulation, to name a few. Terahertz and infrared devices have great potential in applications of next-generation communication, LiDARs, chemical and biological sensing, and advanced optical systems. Novel metamaterial components and devices are being developed to address the challenges in industry, agriculture, bio-medicine, and space exploration. Accordingly, this Special Issue aims to comprise a collection of research papers, communications, and review articles that focus on (1) novel designs, fabrication, and characterization techniques for terahertz and infrared metamaterials based on various physical principles as well as (2) new developments in terahertz and infrared devices enabled by metamaterials for various applications.

Dr. Xiaoguang Zhao
Prof. Dr. Rui You
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 short 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

  • design of terahertz and infrared metamaterials
  • micro/nanofabrication techniques for metamaterials
  • terahertz and infrared metamaterial components
  • terahertz detectors and imagers
  • infrared detectors and focal plane arrays
  • terahertz and infrared biological/chemical sensing
  • terahertz and infrared beamforming
  • communication based on metamaterials
  • application of terahertz and infrared metamaterials

Related Special Issues

Published Papers (5 papers)

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Research

11 pages, 2655 KiB  
Article
Design and Implementation of a Flexible Electromagnetic Actuator for Tunable Terahertz Metamaterials
by Shengru Zhou, Chao Liang, Ziqi Mei, Rongbo Xie, Zhenci Sun, Ji Li, Wenqiang Zhang, Yong Ruan and Xiaoguang Zhao
Micromachines 2024, 15(2), 219; https://doi.org/10.3390/mi15020219 - 31 Jan 2024
Viewed by 806
Abstract
Actuators play a crucial role in microelectromechanical systems (MEMS) and hold substantial potential for applications in various domains, including reconfigurable metamaterials. This research aims to design, fabricate, and characterize structures for the actuation of the EMA. The electromagnetic actuator overcomes the lack of [...] Read more.
Actuators play a crucial role in microelectromechanical systems (MEMS) and hold substantial potential for applications in various domains, including reconfigurable metamaterials. This research aims to design, fabricate, and characterize structures for the actuation of the EMA. The electromagnetic actuator overcomes the lack of high drive voltage required by other actuators. The proposed actuator configuration comprises supporting cantilever beams with fixed ends, an integrated coil positioned above the cantilever’s movable plate, and a permanent magnet located beneath the cantilever’s movable plate to generate a static magnetic field. Utilizing flexible polyimide, the fabrication process of the EMA is simplified, overcoming limitations associated with silicon-based micromachining techniques. Furthermore, this approach potentially enables large-scale production of EMA, with displacement reaching up to 250 μm under a 100 mA current, thereby expanding their scope of applications in manufacturing. To demonstrate the function of the EMA, we integrated it with a metamaterial structure to form a compact, tunable terahertz absorber, demonstrating a potential for reconfigurable electromagnetic space. Full article
(This article belongs to the Special Issue Terahertz and Infrared Metamaterial Devices, 2nd Edition)
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12 pages, 3486 KiB  
Article
Tunable Broadband Terahertz Metamaterial Absorber Based on Vanadium Dioxide and Graphene
by Laifang Zheng, Rui Feng, Huanting Shi and Xuanjing Li
Micromachines 2023, 14(9), 1715; https://doi.org/10.3390/mi14091715 - 31 Aug 2023
Cited by 2 | Viewed by 997
Abstract
We propose a dynamically tunable ultra-broadband terahertz metamaterial absorber, which was based on graphene and vanadium oxide (VO2) and numerically demonstrated. The excellent absorption bandwidth almost entirely greater than 90% was as wide as 6.35 THz from 2.30 to 8.65 THz [...] Read more.
We propose a dynamically tunable ultra-broadband terahertz metamaterial absorber, which was based on graphene and vanadium oxide (VO2) and numerically demonstrated. The excellent absorption bandwidth almost entirely greater than 90% was as wide as 6.35 THz from 2.30 to 8.65 THz under normal incidence. By changing the conductivity of VO2 from 20 S/m to 3 × 105 S/m, the absorption intensity could be dynamically tuned from 6% to 99%. The physical mechanism of the ultra-wideband absorption is discussed based on the interference cancelation, impedance matching theory, and field distributions, and the influences of the structural parameters on absorption are also discussed. According to the symmetric configuration, the absorption spectra of the considered polarizations were very close to each other, resulting in a polarization-insensitive structure. Such a tunable ultra-broadband absorber may have promising potential in the applications of modulating, cloaking, switching, and imaging technology. Full article
(This article belongs to the Special Issue Terahertz and Infrared Metamaterial Devices, 2nd Edition)
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11 pages, 8573 KiB  
Article
Terahertz Biaxial Strain Sensor Based on Double-Upright Cross Metamaterial
by Yanfei Liu, Yu Chen, Jing Li, Chunli Zhang, Qiannan Wu, Ningning Su and Mengwei Li
Micromachines 2023, 14(4), 816; https://doi.org/10.3390/mi14040816 - 04 Apr 2023
Cited by 2 | Viewed by 1499
Abstract
In this article, a terahertz metamaterial biaxial strain pressure sensor structure is proposed, which can address the problems of the low sensitivity, the narrow pressure measurement range, and the uniaxial-only detection of existing terahertz pressure sensors. The performance of the pressure sensor was [...] Read more.
In this article, a terahertz metamaterial biaxial strain pressure sensor structure is proposed, which can address the problems of the low sensitivity, the narrow pressure measurement range, and the uniaxial-only detection of existing terahertz pressure sensors. The performance of the pressure sensor was studied and analyzed using the time-domain finite-element-difference method. By changing the substrate material and optimizing the structure of the top cell, the size of the structure that can simultaneously improve the range and sensitivity of the pressure measurements was determined. The simulation results show that the sensor has a pressure-sensing effect in the frequency range of 1.0–2.2 THz under the conditions of transverse electric (TE) and transverse magnetic (TM) polarization, and the sensitivity can reach up to 346 GHz/μm. The proposed metamaterial pressure sensor has significant applications in the remote monitoring of target structure deformation. Full article
(This article belongs to the Special Issue Terahertz and Infrared Metamaterial Devices, 2nd Edition)
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15 pages, 4433 KiB  
Article
Design and Print Terahertz Metamaterials Based on Electrohydrodynamic Jet
by Tong Yang, Xinyu Li, Bo Yu and Cheng Gong
Micromachines 2023, 14(3), 659; https://doi.org/10.3390/mi14030659 - 15 Mar 2023
Cited by 4 | Viewed by 1590
Abstract
Terahertz metamaterials are some of the core components of the new generation of high-frequency optoelectronic devices, which have excellent properties that natural materials do not have. The unit structures are generally much smaller than the wavelength, so preparation is mainly based on semiconductor [...] Read more.
Terahertz metamaterials are some of the core components of the new generation of high-frequency optoelectronic devices, which have excellent properties that natural materials do not have. The unit structures are generally much smaller than the wavelength, so preparation is mainly based on semiconductor processes, such as coating, photolithography and etching. Although the processing resolution is high, it is also limited by complex processing, long cycles, and high cost. In this paper, a design method for dual-band terahertz metamaterials and a simple, rapid, low-cost metamaterial preparation scheme based on step-motor-driven electrohydrodynamic jet technology are proposed. By transforming an open-source 3D printer, the metamaterial structures can be directly printed without complex semiconductor processes. To verify effectiveness, the sample was directly printed using nano conductive silver paste as consumable material. Then, a fiber-based multi-mode terahertz time-domain spectroscopy system was built for testing. The experimental results were in good agreement with the theoretical simulation. Full article
(This article belongs to the Special Issue Terahertz and Infrared Metamaterial Devices, 2nd Edition)
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9 pages, 4949 KiB  
Article
Wide-Angle Scanning Graphene-Biased Terahertz Coding Meta-Surface
by Yangyang Xu, Rui Yang and Yan Wang
Micromachines 2023, 14(2), 233; https://doi.org/10.3390/mi14020233 - 17 Jan 2023
Cited by 2 | Viewed by 1517
Abstract
We demonstrate a reconfigurable beam steerable meta-surface through a graphene-biased slot-array over a grounded quartz substrate. More specifically, the graphene meta-elements can be dynamically tuned to program the radiations by applying adequate DC bias voltages to different gating pads, capable of turning on [...] Read more.
We demonstrate a reconfigurable beam steerable meta-surface through a graphene-biased slot-array over a grounded quartz substrate. More specifically, the graphene meta-elements can be dynamically tuned to program the radiations by applying adequate DC bias voltages to different gating pads, capable of turning on or off the releasing slots of the guided fields as adjustable switches. In particular, such a graphene-biased terahertz meta-surface will achieve a wide-angle steerable beam at a fixed frequency and the scanning directions can further be modulated when varying the frequency at a certain state of the graphene, thus should pave the way for building up more advanced reconfigurable transceivers and sensors in terahertz wireless electronics. Full article
(This article belongs to the Special Issue Terahertz and Infrared Metamaterial Devices, 2nd Edition)
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