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Terahertz Materials and Technologies in Materials Science (Second Edition)
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Terahertz Materials and Technologies in Materials Science (Second Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: 20 December 2026 | Viewed by 102

Editors

Dr. Meng Liu

E-Mail Website
Guest Editor
Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Interests: terahertz; metasurface; chirality; vanadium dioxide; terahertz time domain spectral system
Special Issues, Collections and Topics in MDPI journals
Dr. Guanhua Ren

E-Mail Website
Guest Editor
Hebei Key Laboratory of Physics and Energy Technology, North China Electric Power University, Baoding 071003, China
Interests: terahertz spectroscopy; terahertz time domain spectral system; terahertz molecular spectroscopy
Dr. Xueqian Zhang

E-Mail Website
Guest Editor
Center for Terahertz Waves and State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin, China
Interests: terahertz; metasurface; electromagnetic field manipulation; meta-devices

Special Issue Information

Dear Colleagues,

Terahertz (THz) metasurfaces, composed of subwavelength metallic or dielectric microstructural arrays with a deep-subwavelength thickness, behave as a novel platform for developing highly efficient and integrated THz functional devices. The development of THz metasurface devices has recently drawn a lot of attention in the fields of THz communication, sensing, display, holographic imaging, non-destructive testing, and electromagnetic cloaking. Various strategies have been proposed and realized to construct novel, efficient, intelligent, and integrable metasurfaces.

This second edition is a continuation of the Special Issue titled "Terahertz Materials and Technologies in Materials Science", which aims to provide a unique international forum for researchers working in THz photonics research and metasurface device development to report their latest endeavors in advancing this field, including the amplitude, phase, and polarization manipulation of THz through the novel microstructural design, the use of various external excitations, and the use of two-dimensional active materials.

We look forward to hearing from you.

Dr. Meng Liu
Dr. Guanhua Ren
Dr. Xueqian Zhang
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials 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 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
  • light field manipulation
  • dynamic control
  • active medium
  • terahertz spectroscopy

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Published Papers (1 paper)

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Research

20 pages, 5140 KB  
Article
Terahertz Time-Domain Spectroscopy for Non-Contact Porosity Estimation and Hydration Assessment of Hardened Cement Paste
by Lidan Tian, Zhiguo Wang, Ya Chen, Wentao Zhang, Linhao Wang and Xiangyu Li
Materials 2026, 19(13), 2726; https://doi.org/10.3390/ma19132726 (registering DOI) - 25 Jun 2026
Abstract
This study presents a systematic terahertz time-domain spectroscopy (THz-TDS) investigation of hardened cement paste, framed as a complex-optical measurement in which the real and imaginary parts of the response probe distinct microstructural attributes. Transmission-mode measurements were made on pastes with water-to-cement (w/c) ratios [...] Read more.
This study presents a systematic terahertz time-domain spectroscopy (THz-TDS) investigation of hardened cement paste, framed as a complex-optical measurement in which the real and imaginary parts of the response probe distinct microstructural attributes. Transmission-mode measurements were made on pastes with water-to-cement (w/c) ratios of 0.3, 0.4, and 0.5 at curing ages of 7, 14, 28, and 56 days. The effective refractive index, obtained from the time-domain pulse delay (7, 28, and 56 days, paired with mercury intrusion porosimetry), correlates strongly and linearly with porosity over nine porosity-paired conditions spanning 15.1–30.4% (pooled R2 = 0.94, p < 0.001). In a quasi-static effective-medium framework—where the pores a re far smaller than the THz wavelength—this reflects the dependence of the effective permittivity on the solid volume fraction: the Bruggeman model outperforms the Maxwell–Garnett model, and all data fall within the Wiener bounds, lying close to the upper bound, indicating a continuously connected solid matrix with isolated pores. Cross-validated porosity estimation is reliable to within about ±2 percentage points (refractive-index uncertainty ±0.02–0.04). The absorption follows a power law (β ≈ 1.0–1.3) characteristic of disorder-activated vibrational absorption, in which the loss of long-range order in the amorphous C–S–H relaxes the crystalline selection rules and couples the THz field to the full vibrational density of states. The refractive index (structure-sensitive, governed by volume fraction) and the absorption (material-sensitive, governed by solid disorder; estimated loss tangent of order 0.1) thus form two complementary channels. Combining the THz-derived porosity with the Powers hydration model gives a degree of hydration consistent with literature ranges—an indirect comparison rather than direct validation. These results establish THz-TDS as a non-contact, non-ionizing technique for rapid porosity estimation and hydration assessment of cementitious materials. Full article
(This article belongs to the Special Issue Terahertz Materials and Technologies in Materials Science (Second Edition))
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