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Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications

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A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (30 November 2019) | Viewed by 22061

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Special Issue Editors

Prof. Dr. Marcello D'Amore

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Guest Editor

Department of Astronautics, Electrical and Energy Engineering (DIAEE) of Sapienza University of Rome, Research Center on Nanotechnology applied to Engineering of Sapienza University (CNIS), Roma, Italy
Interests: design of shielding and absorbing structures in the field of 5G and 6G technology; terahertz micro-nano protection devices; electromagnetic compatibility

Prof. Dr. Maria Sabrina Sarto

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Guest Editor

Department of Astronautics, Electrical and Energy Engineering (DIAEE) of Sapienza University of Rome, Research Center on Nanotechnology applied to Engineering of Sapienza University (CNIS), 00184 Roma, Italy
Interests: nanotechnology; graphene-based nanomaterials for electromagnetic shielding and sensing; radar absorbing materials; piezoresistive and piezoelectric sensors; wearable sensor technology; electromagnetic compatibility

Dr. Alessandro Giuseppe D’Aloia

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Guest Editor

1. Department of Astronautical, Electrical and Energy Engineering, Sapienza University of Rome, via Eu-dossiana 18, 00184 Rome, Italy
2. Research Center on Nanotechnology Applied to Engineering of Sapienza (CNIS), Sapienza University of Rome, via Eudossiana 18, 00184 Rome, Italy
Interests: development and electromagnetic modeling of graphene-based nanocomposites and nanostructured materials for electromagnetic compatibility and sensing applications; radar absorbing materials; piezoresistive sensors; wearable sensor technology
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Special Issue Information

Dear Colleagues,

In the past few years, the field of terahertz (THz) and sub-THz science and technology has grown exponentially thanks to its multidisciplinary applications, varying from security scanning, medical imaging, sensing, and ultrafast wireless communications.

New powerful THz sources and cost-effective and high-efficiency radiating structures are being studied from both academia and industry. Moreover, the fabrication, characterization and modeling of protection systems against THz or sub-THz electromagnetic interference (EMI) are becoming a new frontier of advanced technological research. In this context, graphene-based nanomaterials and nanostructures are attracting ever-growing-interest, thanks to their exceptional electrical, mechanical and thermal properties.

This Special Issue is aimed to present recent advances in the development of broadband absorbing and shielding screens up to terahertz frequency range based on the use of graphene-based nanomaterials and nanostructures.

Suggested topics to be covered in this Special Issue include:

Fabrication/characterization/modeling of graphene-based nanomaterials and nanostructures for shielding and absorbing applications in the THz and sub-THz frequency regime;
Graphene based wave filters and frequency selective surfaces in the THz and sub-THz frequency regime;
Effective-medium models of periodic multilayered or nanocomposite coatings.

Prof. Dr. Marcello D'Amore
Prof. Dr. Maria Sabrina Sarto
Dr. Alessandro Giuseppe D’Aloia
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. Nanomaterials is an international peer-reviewed open access semimonthly 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 2900 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

Graphene-based nanomaterials synthesis/characterization/modeling
Absorbing and shielding protection devices against EMI
Effective homogeneous models
Protection performances up to terahertz

Published Papers (5 papers)

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Research

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17 pages, 5020 KiB

Open AccessArticle

Low-Terahertz Transparent Graphene-Based Absorber

by Alessandro Giuseppe D’Aloia, Marcello D’Amore and Maria Sabrina Sarto

Nanomaterials 2020, 10(5), 843; https://doi.org/10.3390/nano10050843 - 28 Apr 2020

Cited by 7 | Viewed by 2398

Abstract

A new, transparent, metal-free absorber, based on the use of multilayer graphene/dielectric laminates (GLs), is proposed for applications in the low-terahertz frequency range. The designed absorber has a total thickness of around 70 µm and consists of a front matching dielectric layer followed by a GL, a dielectric spacer and a back GL. The laminates are periodic structures constituted of graphene sheets separated by 50-nm-thick polyethylene terephthalate (PET) interlayers, while the matching layer and the spacer are one-quarter-wavelength thick and made of PET. The GLs are modeled as homogeneous-equivalent single layers (ESLs) characterized by their sheet resistances R_s. An innovative analytical method is proposed in order to select R_s values optimizing the electromagnetic wave absorption either in low-gigahertz or low-terahertz frequency range. The frequency spectra of the absorption, reflection and transmission coefficients are computed in the range up to 4 THz by using different values of R_s. Then, realistic R_s values of chemically doped graphene monolayers over PET substrates are considered. The designed absorbers are characterized by an absorption coefficient with a peak value of about 0.8 at the first resonant frequency of 1.1 THz, and a 1.4 THz bandwidth centered at 1.5 THz with reflection coefficient below - 10 dB. Moreover, the optical transmittance of the proposed absorbers are computed by means of the optical matrix theory and it is found to be greater than 86% in all the visible ranges. Full article

(This article belongs to the Special Issue Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications)

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9 pages, 4743 KiB

Open AccessArticle

A Simple and Efficient Method for Designing Broadband Terahertz Absorber Based on Singular Graphene Metasurface

by Zhongmin Liu, Liang Guo and Qingmao Zhang

Nanomaterials 2019, 9(10), 1351; https://doi.org/10.3390/nano9101351 - 20 Sep 2019

Cited by 31 | Viewed by 3205

Abstract

In this paper, we propose a simple and efficient method for designing a broadband terahertz (THz) absorber based on singular graphene patches metasurface and metal-backed dielectric layer. An accurate circuit model of graphene patches is used for obtaining analytical expressions for the input impedance of the proposed absorber. The input impedance is designed to be closely matched to the free space in a wide frequency range. Numerical simulation and analytical circuit model results consistently show that graphene metasurface-based THz absorber with an absorption value above 90% in a relative bandwidth of 100% has been achieved. Full article

(This article belongs to the Special Issue Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications)

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11 pages, 4724 KiB

Open AccessArticle

Graphene-Based THz Absorber with a Broad Band for Tuning the Absorption Rate and a Narrow Band for Tuning the Absorbing Frequency

by Qihui Zhou, Peiguo Liu, Chenxi Liu, Yuandong Zhou and Song Zha

Nanomaterials 2019, 9(8), 1138; https://doi.org/10.3390/nano9081138 - 08 Aug 2019

Cited by 23 | Viewed by 3291

Abstract

In this paper, we propose a broadband absorption-controllable absorber based on nested nanostructure graphene and a narrowband frequency-tunable absorber utilizing gold-graphene hybrid structure in the terahertz regime. The numerical simulation results showed that the absorption of the broadband absorber can be changed from 27% to more than 90% over 0.75 to 1.7 THz by regulating the chemical potential of graphene. With the same regulation mechanism, the absorbing peak of the narrowband absorber can be moved from 2.29 to 2.48 THz continuously with absorption of 90%. Furthermore, via the cascade of the two types of absorbers, an independently tunable dual-band absorber is constituted. Its absorption spectrum is the superposition of absorption-controllable absorber and frequency-tunable absorber. The absorptivity and operating frequency of the two absorbing bands can be tuned independently without mutual inference. Moreover, it is insensitive to the polarization and it maintains high absorption over a wide range of incident angle. For the flexibility, tunability as well as the independence of polarization and angle, this design has wide prospects in various applications. Full article

(This article belongs to the Special Issue Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications)

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Graphical abstract

11 pages, 5226 KiB

Open AccessArticle

Frequency-Reconfigurable Wide-Angle Terahertz Absorbers Using Single- and Double-Layer Decussate Graphene Ribbon Arrays

by Longfang Ye, Fang Zeng, Yong Zhang, Xiong Xu, Xiaofan Yang and Qing Huo Liu

Nanomaterials 2018, 8(10), 834; https://doi.org/10.3390/nano8100834 - 14 Oct 2018

Cited by 22 | Viewed by 3362

Abstract

We propose and numerically demonstrate two novel terahertz absorbers made up of periodic single- and double-layer decussate graphene ribbon arrays. The simulated results show that the proposed absorbers have narrowband near-unity terahertz absorption with ultra-wide frequency reconfiguration and angular stability. By tuning the Fermi level of graphene ribbons, the over 90% absorbance peak frequency of the absorber with single-layer graphene structure can be flexibly adjusted from 6.85 to 9.85 THz for both the transverse magnetic (TM) and transverse electric (TE) polarizations. This absorber with single-layer graphene demonstrates excellent angular stability with the absorbance peaks of the reconfigurable absorption bands remaining over 99.8% in a wide angle of incidence ranging from 0 to 70°. The tuning frequency can be significantly enhanced by using the absorber with double-layer graphene structure from 5.50 to 11.28 THz and 5.62 to 10.65 THz, approaching two octaves under TM and TE polarizations, respectively. The absorbance peaks of the reconfigurable absorption band of this absorber for both polarizations maintain over 70%, even at a large angle of incidence up to 70°. Furthermore, an analytical fitting model is also proposed to accurately predict the absorbance peak frequencies for this variety of absorbers. Benefitting from these attractive properties, the proposed absorber may have great potential applications in tunable terahertz trapping, detecting, sensing, and various terahertz optoelectronic devices. Full article

(This article belongs to the Special Issue Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications)

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Review

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33 pages, 10217 KiB

Open AccessReview

A Review of THz Modulators with Dynamic Tunable Metasurfaces

by Lan Wang, Yaxin Zhang, Xiaoqing Guo, Ting Chen, Huajie Liang, Xiaolin Hao, Xu Hou, Wei Kou, Yuncheng Zhao, Tianchi Zhou, Shixiong Liang and Ziqiang Yang

Nanomaterials 2019, 9(7), 965; https://doi.org/10.3390/nano9070965 - 01 Jul 2019

Cited by 87 | Viewed by 9215

Abstract

Terahertz (THz) radiation has received much attention during the past few decades for its potential applications in various fields, such as spectroscopy, imaging, and wireless communications. To use terahertz waves for data transmission in different application systems, the efficient and rapid modulation of terahertz waves is required and has become an in-depth research topic. Since the turn of the century, research on metasurfaces has rapidly developed, and the scope of novel functions and operating frequency ranges has been substantially expanded, especially in the terahertz range. The combination of metasurfaces and semiconductors has facilitated both new opportunities for the development of dynamic THz functional devices and significant achievements in THz modulators. This paper provides an overview of THz modulators based on different kinds of dynamic tunable metasurfaces combined with semiconductors, two-dimensional electron gas heterostructures, superconductors, phase-transition materials, graphene, and other 2D material. Based on the overview, a brief discussion with perspectives will be presented. We hope that this review will help more researchers learn about the recent developments and challenges of THz modulators and contribute to this field. Full article

(This article belongs to the Special Issue Graphene-Based Nanomaterials and Nanostructures for Low-Terahertz Shielding and Absorbing Applications)

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