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Special Issue "Nanomaterials for Terahertz Technology Applications"

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A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: 31 January 2024 | Viewed by 2880

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Special Issue Editors

Prof. Dr. Xunjun He

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Guest Editor

Key Laboratory of Engineering Dielectric and Applications, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
Interests: terahertz devices; terahertz metamaterials/metasurfaces; terahertz technology applications

Dr. Ying Zhang

E-Mail Website
Guest Editor

School of Sciences, Harbin University of Science and Technology, Harbin 150080, China
Interests: terahertz devices; terahertz metamaterials; terahertz wave excitation and detection techniques

Special Issue Information

Dear Colleagues,

Over the past several decades, terahertz technology has achieved considerable progress with the development of nanoscience and nanotechnology. In particular, nanomaterials for terahertz technology applications are also attracting extensive attention in various areas, such as national defense, military, chemistry, medicine, pharmaceutical, communications, and many other fields. In order to utilize terahertz technology flexibly and efficiently, it is currently important and necessary to develop novel terahertz devices and systems via the versatility of nanomaterials and nanostructures.

This Special Issue of Nanomaterials aims to explore nanomaterials for terahertz technology applications. The format of welcomed articles includes full papers, communications, and reviews. Potential topics include, but are not limited to, nanomaterials and nanostructures for terahertz technology applications (terahertz devices; terahertz generation and propagation; terahertz imaging; terahertz sources, detectors and receivers; terahertz sensing and diagnostics; terahertz nanoelectronics; terahertz spectroscopy; terahertz metamaterials/metasurfaces; etc.).

Prof. Dr. Xunjun He
Dr. Ying Zhang
Guest Editors

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Keywords

terahertz
metamaterials
metasurfaces
sensing
imaging
detecting
devices

Published Papers (4 papers)

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Research

15 pages, 16631 KiB

Open AccessArticle

Full-Space Wavefront Shaping of Broadband Vortex Beam with Switchable Terahertz Metasurface Based on Vanadium Dioxide

and

Nanomaterials 2023, 13(23), 3023; https://doi.org/10.3390/nano13233023 - 26 Nov 2023

Viewed by 288

Abstract

Currently, vortex beams are extensively utilized in the information transmission and storage of communication systems due to their additional degree of freedom. However, traditional terahertz metasurfaces only focus on the generation of narrowband vortex beams in reflection or transmission mode, which is unbeneficial for practical applications. Here, we propose and design terahertz metasurface unit cells composed of anisotropic Z-shaped metal structures, two dielectric layers, and a VO₂ film layer. By utilizing the Pancharatnam–Berry phase theory, independent control of a full 2π phase over a wide frequency range can be achieved by rotating the unit cell. Moreover, the full-space mode (transmission and reflection) can also be implemented by utilizing the phase transition of VO₂ film. Based on the convolution operation, three different terahertz metasurfaces are created to generate vortex beams with different wavefronts in full-space, such as deflected vortex beams, focused vortex beams, and non-diffraction vortex beams. Additionally, the divergences of these vortex beams are also analyzed. Therefore, our designed metasurfaces are capable of efficiently shaping the wavefronts of broadband vortex beams in full-space, making them promising applications for long-distance transmission, high integration, and large capacity in 6G terahertz communications. Full article

(This article belongs to the Special Issue Nanomaterials for Terahertz Technology Applications)

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12 pages, 2783 KiB

Open AccessArticle

Strain versus Tunable Terahertz Nanogap Width: A Simple Formula and a Trench below

Hwanhee Kim

Mahsa Haddadi Moghaddam

and

Nanomaterials 2023, 13(18), 2526; https://doi.org/10.3390/nano13182526 - 09 Sep 2023

Cited by 1 | Viewed by 549

Abstract

A flexible zerogap metallic structure is periodically formed, healing metal cracks on a flexible substrate. Zerogap is continuously tunable from nearly zero to one hundred nanometers by applying compressive strains on the flexible substrate. However, there have been few studies on how the gap width is related to the strain and periodicity, nor the mechanism of tunability itself. Here, based on atomic force microscopy (AFM) measurements, we found that 200 nm-deep nano-trenches are periodically generated on the polymer substrate below the zerogap owing to the strain singularities extant between the first and the second metallic deposition layers. Terahertz and visible transmission properties are consistent with this picture whereby the outer-bending polyethylene terephthalate (PET) substrate controls the gap size linearly with the inverse of the radius of the curvature. Full article

(This article belongs to the Special Issue Nanomaterials for Terahertz Technology Applications)

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13 pages, 5684 KiB

Open AccessArticle

Switchable and Tunable Terahertz Metamaterial Based on Vanadium Dioxide and Photosensitive Silicon

and

Nanomaterials 2023, 13(14), 2144; https://doi.org/10.3390/nano13142144 - 24 Jul 2023

Viewed by 848

Abstract

A switchable and tunable terahertz (THz) metamaterial based on photosensitive silicon and Vanadium dioxide (VO₂) was proposed. By using a finite-difference time-domain (FDTD) method, the transmission and reflective properties of the metamaterial were investigated theoretically. The results imply that the metamaterial can realize a dual electromagnetically induced transparency (EIT) or two narrow-band absorptions depending on the temperature of the VO₂. Additionally, the magnitude of the EIT and two narrow-band absorptions can be tuned by varying the conductivity of photosensitive silicon (PSi) via pumping light. Correspondingly, the slow-light effect accompanying the EIT can also be adjusted. Full article

(This article belongs to the Special Issue Nanomaterials for Terahertz Technology Applications)

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17 pages, 42229 KiB

Open AccessArticle

Coexistence of Bloch and Parametric Mechanisms of High-Frequency Gain in Doped Superlattices

and

Nanomaterials 2023, 13(13), 1993; https://doi.org/10.3390/nano13131993 - 01 Jul 2023

Viewed by 545

Abstract

The detailed theoretical study of high-frequency signal gain, when a probe microwave signal is comparable to the AC pump electric field in a semiconductor superlattice, is presented. We identified conditions under which a doped superlattice biased by both DC and AC fields can generate or amplify high-frequency radiation composed of harmonics, half-harmonics, and fractional harmonics. Physical mechanisms behind the effects are discussed. It is revealed that in a general case, the amplification mechanism in superlattices is determined by the coexistence of both the phase-independent Bloch and phase-dependent parametric gain mechanisms. The interplay and contribution of these gain mechanisms can be adjusted by the sweeping AC pump strength and leveraging a proper phase between the pump and strong probe electric fields. Notably, a transition from the Bloch gain to the parametric gain, often naturally occurring as the amplitude of the amplified signal field grows, can facilitate an effective method of fractional harmonic generation in DC–AC-driven superlattices. The study also uncovers that the pure parametric generation of the fractional harmonics can be initiated via their ignition by switching the DC pump electric field. The findings open a promising avenue for the advancement of new miniature GHz–THz frequency generators, amplifiers, and dividers operating at room temperature. Full article

(This article belongs to the Special Issue Nanomaterials for Terahertz Technology Applications)

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