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Nanomaterials
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Ultrafast Terahertz Photonics in Nanoscale and Applications
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Ultrafast Terahertz Photonics in Nanoscale and Applications

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

Deadline for manuscript submissions: 10 October 2026 | Viewed by 1182

Special Issue Editor

Dr. Sen Gong

E-Mail Website
Guest Editor
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610000, China
Interests: metamaterials; terahertz control and communication technology; field effect transistors

Special Issue Information

Dear Colleagues,

The terahertz frequency band acts as a bridge between microwaves and light, boasting the advantage of a large bandwidth, like light, and wireless transmission capability, like microwaves, making it a candidate for next-generation information technology. Benefiting from the development of terahertz ultrafast photonics, the advantages of this frequency band are beginning to be fully leveraged. A series of high-performance techniques have been designed in multiple fields, such as ultrafast modulation, ultra-broadband detection, and terahertz signal generation, highlighting the role of terahertz frequencies in next-generation information technology.

This Issue aims to introduce the state of the art of terahertz ultrafast photonics in relation to functional devices and system applications, seeking to facilitate the application of terahertz ultrafast photonics in next-generation information technology and other related fields.

Dr. Sen Gong
Guest Editor

Manuscript Submission Information

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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 2400 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

  • ultrafast modulation
  • ultrafast detection
  • terahertz source
  • ultrafast carrier dynamics
  • applications of ultrafast terahertz photonics

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Published Papers (2 papers)

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Research

15 pages, 1992 KB  
Article
Tunable Triple-Band Terahertz Perfect Absorber and Four-Input AND Gate Based on a Graphene Metamaterial
by Shuxin Xu, Lili Zeng, Zhengzheng Shao, Boxun Li, Wenjie Hu, Yiyu Tu and Xingyi Zhu
Nanomaterials 2026, 16(8), 494; https://doi.org/10.3390/nano16080494 - 21 Apr 2026
Viewed by 422
Abstract
This study introduces a switchable and tunable multimodal, multi-peak, perfect terahertz absorber, utilizing a composite structure of graphene and double concentric metal rings. From bottom to top, the absorber consists of a gold substrate, a SiO2 dielectric layer, a patterned graphene layer, [...] Read more.
This study introduces a switchable and tunable multimodal, multi-peak, perfect terahertz absorber, utilizing a composite structure of graphene and double concentric metal rings. From bottom to top, the absorber consists of a gold substrate, a SiO2 dielectric layer, a patterned graphene layer, another SiO2 dielectric layer, and double concentric metal rings on the top. The structure achieves three high-absorption resonance peaks in the far-infrared band: a relatively broad peak with 99.05% absorptance at 38.128 THz, and two extremely narrow peaks with 99.56% and 97.23% absorptance at 47.909 THz and 49.873 THz, respectively. Analysis of the absorption spectra and electric field distributions reveals that the generation mechanism of Peak I is Fabry–Pérot cavity resonance, while Peaks II and III result from the coupling between the high-order localized surface plasmons in the outer ring and the graphene surface plasmon polaritons. Benefiting from graphene’s excellent electrical tunability, the absorption peaks’ positions and intensities can be dynamically tuned by varying the Fermi level. The core innovation of this work lies in the high-level integration of multiple functionalities. By leveraging the sensitive response of Peak III to variations in the Fermi level, a four-input AND logic gate is embedded within the metamaterial absorber in this frequency band. The Fermi levels of four independent graphene regions serve as the binary inputs, while the absorption state of Peak III is defined as the logical output. Additionally, the two narrow peaks display high sensitivity to the surrounding refractive index, with sensitivities of 30.1 THz/RIU and 62.5 THz/RIU, demonstrating significant potential for sensing. This multifunctional integrated device combines tunable absorption, a logic gate, and sensing capabilities, making it promising for terahertz communication systems, intelligent sensing networks, and reconfigurable platforms. Full article
(This article belongs to the Special Issue Ultrafast Terahertz Photonics in Nanoscale and Applications)
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10 pages, 819 KB  
Article
Ultrafast Spin Dynamics of Pt/Gd19(Co0.8Fe0.2)81/Ta Heterostructure Investigated by Double-Pump Terahertz Emission Spectroscopy
by Changwei Li, Bo Lu, Nuoxi Yu, Zhangshun Li, Haoran Xu, Huiping Zhang and Zuanming Jin
Nanomaterials 2026, 16(7), 390; https://doi.org/10.3390/nano16070390 - 24 Mar 2026
Viewed by 477
Abstract
Ultrafast spin dynamics is a core research focus for advancing ultrafast spintronic devices, yet its accurate quantitative probing remains a challenge with conventional time-resolved techniques. Herein, we employ double-pump optical pump–terahertz emission spectroscopy (OPTE) to investigate the ultrafast spin dynamics of a Pt/Gd [...] Read more.
Ultrafast spin dynamics is a core research focus for advancing ultrafast spintronic devices, yet its accurate quantitative probing remains a challenge with conventional time-resolved techniques. Herein, we employ double-pump optical pump–terahertz emission spectroscopy (OPTE) to investigate the ultrafast spin dynamics of a Pt/Gd19(Co0.8Fe0.2)81/Ta ferrimagnetic rare-earth–transition-metal heterostructure. Experimental measurements resolve a single-step ultrafast demagnetization process with a characteristic time of ~0.42 ± 0.02 ps, followed by two-stage magnetic recovery involving a fast relaxation and a slow relaxation process. The fast and slow recovery time constants show a distinct positive dependence on the control pump fluence, increasing from 2.49 ± 0.11 ps to 3.28 ± 0.03 ps and 57.36 ± 11.28 ps to 164.96 ± 1.61 ps, respectively, as the pump fluence rises from 0.80 to 1.19 mJ/cm2. The ~0.42 ps demagnetization timescale is consistent with that of 3d transition metals, indicating the transient magnetic response of the low-Gd-concentration heterostructure is dominated by the CoFe sublattice. Our findings validate that OPTE is an effective approach for the quantitative characterization of electron–lattice–spin coupling processes in spin-based heterostructures and provide critical experimental insights for controllable manipulation of ultrafast spin dynamics, laying a foundation for the design of ultrafast terahertz spintronic devices. Full article
(This article belongs to the Special Issue Ultrafast Terahertz Photonics in Nanoscale and Applications)
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