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Crystals
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Optical Crystals: Optical Properties and Applications in the Terahertz Range
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Optical Crystals: Optical Properties and Applications in the Terahertz Range

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (30 December 2022) | Viewed by 6373

Special Issue Editors

Dr. Longhuang Tang

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Guest Editor
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 622150, China
Interests: optical terahertz generation; terahertz spectroscopy; nonlinear frequency conversion
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Degang Xu

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Guest Editor
School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
Interests: laser technology; spectral imaging technology; marine Lidar technology
Special Issues, Collections and Topics in MDPI journals
Dr. Maorong Wang

E-Mail Website
Guest Editor
Optoelectronic Materials and Technologies Engineering Laboratory, Physics Department, QingDao University of Science and Technology, Qingdao 260061, China
Interests: solid-state laser; terahertz optics; photoelectric detection
Dr. Xiaolei Bai

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Guest Editor
School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China
Interests: single-frequency fiber laser; optical frequency conversion; terahertz radiation genration
Dr. Weijun Wang

E-Mail Website
Guest Editor
Institute of Applied Electronics, Chinese Academy of Engineering Physics, Mianyang 622150, China
Interests: terahertz modulation; metamaterials; plasma-induced transparency; terahertz free electron laser

Special Issue Information

Dear Colleagues,

It is our pleasure to announce a new Special Issue of Crystals entitled Optical Crystals: Optical Properties and Applications in the Terahertz Range. It will cover both the theoretical and experimental advances of organic and inorganic optical crystals in the terahertz research field with a particular emphasis on the properties of crystals and terahertz technologies based on optical crystals. Research focused on applications involving generation, modulation, detection, and spectrometry in the terahertz range are particularly welcome. Considering that the validation of a supposition is usually realized via a cross-check, studies that use combined approaches are also welcome.

Dr. Longhuang Tang
Prof. Dr. Degang Xu
Dr. Maorong Wang
Dr. Xiaolei Bai
Dr. Weijun Wang
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. Crystals 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

  • optics crystals
  • terahertz photonics
  • nonlinear optics
  • ultrafast optics
  • terahertz spectrometry

Published Papers (3 papers)

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Research

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13 pages, 7519 KiB  
Article
Magneto-Optical Spin Hall Effect Regulation at Terahertz Frequencies Based on Graphene–Gold Heterojunction
by Li Luo, Junlin Guo, Sui Peng, Bo Liu, Yuting Wang and Xiao Liu
Crystals 2023, 13(1), 78; https://doi.org/10.3390/cryst13010078 - 01 Jan 2023
Viewed by 1297
Abstract
In this paper, we theoretically consider the magneto-optical spin Hall effect of light (MOSHEL) in a graphene–gold heterojunction structure at terahertz frequencies, and determine the maximum value of the transverse shift of the spin Hall effect of light (SHEL) in the designed structure [...] Read more.
In this paper, we theoretically consider the magneto-optical spin Hall effect of light (MOSHEL) in a graphene–gold heterojunction structure at terahertz frequencies, and determine the maximum value of the transverse shift of the spin Hall effect of light (SHEL) in the designed structure by varying the terahertz frequency, the thickness of the metal layer, the Fermi energy level of the graphene, and the magnetic induction density. When the terahertz frequency was 1.2 THz, the metal layer thickness 50 nm, the Fermi level 0.2 eV, and the magnetic induction density B was 10 T, the SHEL shifts of left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) components was greatest at the critical angle (58°), with as value of 498μm, 1000 times larger than the visible light. At this point, graphene exhibited a significant magneto-optical effect, dramatically enhancing the splitting extrema of LHCP and RHCP. This structure will provide possibilities for enhancement of the transverse shift and efficient regulation of the optical spin Hall effect within the terahertz range. Full article
(This article belongs to the Special Issue Optical Crystals: Optical Properties and Applications in the Terahertz Range)
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9 pages, 2875 KiB  
Article
Mid-Infrared Dual-Wavelength Passively Q-Switched Er: SrF2 Laser by CsPbCl3 Quantum Dots Absorber
by Leilei Guo, Maorong Wang, Yifan Zhang, Shuaiyi Zhang, Kai Zhong, Qiuling Zhao, Lihua Teng, Xia Wang and Jianquan Yao
Crystals 2022, 12(9), 1265; https://doi.org/10.3390/cryst12091265 - 06 Sep 2022
Cited by 7 | Viewed by 1352
Abstract
A passively Q-switched compact dual-wavelength Er: SrF2 laser, operating at a 2729.73 nm and 2747.2 nm wavelength, was demonstrated by utilizing CsPbCl3 quantum dots (QDs) as a saturable absorber (SA). The maximum average output power with the shortest duration of 510 [...] Read more.
A passively Q-switched compact dual-wavelength Er: SrF2 laser, operating at a 2729.73 nm and 2747.2 nm wavelength, was demonstrated by utilizing CsPbCl3 quantum dots (QDs) as a saturable absorber (SA). The maximum average output power with the shortest duration of 510 ns and a repetition rate of 45 kHz was achieved at 190 mW, and the corresponding maximum single pulse energy and the peak power were 73.69 μJ and 141.7 W, respectively. The results present an efficient dual-wavelength laser source, and the halogen perovskite quantum dot has the potential to be employed as an excellent saturable absorber in mid-infrared pulsed solid-state lasers. Full article
(This article belongs to the Special Issue Optical Crystals: Optical Properties and Applications in the Terahertz Range)
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Review

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14 pages, 1690 KiB  
Review
Optical Terahertz Sources Based on Difference Frequency Generation in Nonlinear Crystals
by Yang Liu, Kai Zhong, Aiqiang Wang, Mengchen Zhou, Shanchuang Li, Lu Gao and Ze Zhang
Crystals 2022, 12(7), 936; https://doi.org/10.3390/cryst12070936 - 01 Jul 2022
Cited by 9 | Viewed by 3082
Abstract
Terahertz (THz) sources, ranging from 0.1 THz to 10 THz, between microwaves and infrared waves, have important applications in spectral detection, medical imaging, communication, etc. Difference frequency generation (DFG) is an effective method for generating terahertz with the characteristics of low cost, simple [...] Read more.
Terahertz (THz) sources, ranging from 0.1 THz to 10 THz, between microwaves and infrared waves, have important applications in spectral detection, medical imaging, communication, etc. Difference frequency generation (DFG) is an effective method for generating terahertz with the characteristics of low cost, simple structure, widely tunable range, no threshold, and room-temperature operation. This paper reviews various optical terahertz sources of difference frequency generation based on nonlinear crystals, including DFG with inorganic crystals, DFG with organic crystals, DFG with quasi-phase-matching (QPM) crystals, DFG in waveguides, cavity-enhanced DFG, and cascaded DFG. Their recent advances, as well as their advantages and disadvantages, are fully present and discussed. This review is expected to provide a comprehensive reference for researchers in this field and a quick understanding of optical THz sources of difference frequency generation with nonlinear crystals. Full article
(This article belongs to the Special Issue Optical Crystals: Optical Properties and Applications in the Terahertz Range)
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