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Terahertz Optics, Beam Shaping and Imaging

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 5597

Special Issue Editor


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Guest Editor
Warsaw University of Technology, Faculty of Physics, 75 Koszykowa, 00-662 Warsaw, Poland
Interests: diffractive optics; holography; Fourier optics; optical information processing; terahertz technologies

Special Issue Information

Dear Colleagues,

Everybody who have tried to conduct an experiment with terahertz radiation knows how special and exceptional it is. No matter which sources and detectors we use, in many cases something unexpected may be found giving us, as curious researchers of world, the pleasure of discovering new peculiarities and then understanding new phenomena. Terahertz frequencies still lacking in efficient, easily accessible and inexpensive emission and registration components, however, in addition, there is a tremendous need of cunning forming and redirecting beams, their focusing and shaping in a desired way. This special issue is related to different optical elements used for terahertz frequencies, various optical setups enabling forming terahertz images and diverse methods of shaping terahertz beams.

Having great honor and pleasure of editing this special issue, I cordially invite you to submit your original research on all related topics, including:

  • Terahertz optical elements—reflective, refractive, and diffractive;
  • Metamaterial and subwave optics;
  • Terahertz imaging;
  • Terahertz beam shaping;
  • Terahertz emitters and detectors.

Dr. Agnieszka Siemion
Guest Editor

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. Applied Sciences 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

  • terahertz optical elements
  • reflective optics
  • refractive lenses and devices
  • diffractive optical elements
  • metamaterial structures
  • subwave design
  • propagation methods
  • terahertz radiation
  • imaging and non-imaging optical design
  • beam shaping
  • focusing and beam steering
  • optical setups
  • forming images
  • emitters and detectors

Published Papers (2 papers)

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Research

14 pages, 24289 KiB  
Article
Frequency Division Multiplexing of Terahertz Waves Realized by Diffractive Optical Elements
by Paweł Komorowski, Patrycja Czerwińska, Mateusz Kaluza, Mateusz Surma, Przemysław Zagrajek, Artur Sobczyk, Wiesław Ciurapiński, Ryszard Piramidowicz and Agnieszka Siemion
Appl. Sci. 2021, 11(14), 6246; https://doi.org/10.3390/app11146246 - 6 Jul 2021
Cited by 14 | Viewed by 2573
Abstract
Recently, one of the most commonly discussed applications of terahertz radiation is wireless telecommunication. It is believed that the future 6G systems will utilize this frequency range. Although the exact technology of future telecommunication systems is not yet known, it is certain that [...] Read more.
Recently, one of the most commonly discussed applications of terahertz radiation is wireless telecommunication. It is believed that the future 6G systems will utilize this frequency range. Although the exact technology of future telecommunication systems is not yet known, it is certain that methods for increasing their bandwidth should be investigated in advance. In this paper, we present the diffractive optical elements for the frequency division multiplexing of terahertz waves. The structures have been designed as a combination of a binary phase grating and a converging diffractive lens. The grating allows for differentiating the frequencies, while the lens assures separation and focusing at the finite distance. Designed structures have been manufactured from polyamide PA12 using the SLS 3D printer and verified experimentally. Simulations and experimental results are shown for different focal lengths. Moreover, parallel data transmission is shown for two channels of different carrier frequencies propagating in the same optical path. The designed structure allowed for detecting both signals independently without observable crosstalk. The proposed diffractive elements can work in a wide range of terahertz and sub-terahertz frequencies, depending on the design assumptions. Therefore, they can be considered as an appealing solution, regardless of the band finally used by the future telecommunication systems. Full article
(This article belongs to the Special Issue Terahertz Optics, Beam Shaping and Imaging)
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11 pages, 4790 KiB  
Article
Terahertz Spiral Spatial Filtering Imaging
by Hui Liu, Shiyou Wu, Meng Zhao, Chao Li, XiaoJun Liu and Guangyou Fang
Appl. Sci. 2021, 11(6), 2526; https://doi.org/10.3390/app11062526 - 11 Mar 2021
Cited by 3 | Viewed by 2326
Abstract
In this paper, we propose a terahertz (THz) spiral spatial filtering (SSF) imaging method that can enable image contrast enhancement. The related theory includes three main steps: (1) the THz image of the target is Fourier transformed to the spatial spectrum distribution; (2) [...] Read more.
In this paper, we propose a terahertz (THz) spiral spatial filtering (SSF) imaging method that can enable image contrast enhancement. The related theory includes three main steps: (1) the THz image of the target is Fourier transformed to the spatial spectrum distribution; (2) the spatial spectrum is modulated by a spiral phase at the Fourier plane; (3) the filtered spatial spectrum is inverse Fourier transformed to the desired THz image. Meanwhile, analytic expression of the final THz image is derived. Due to the unique nature of the spiral phase, THz image contrast enhancement can be achieved and verified by various simulated target images with different contrasts. In our designed THz SSF imaging system, Fourier transform is carried out by the lens, and the spiral phase is acquired by the spiral phase plate (SPP). Proof-of-principle experiments with three different types of targets (carved metal letters, a high-density polyethylene (HDPE) piece with a scratch, and a leaf) were carried out, and the effectiveness of contrast enhancement and edge extraction on the THz reconstruction images was validated. Full article
(This article belongs to the Special Issue Terahertz Optics, Beam Shaping and Imaging)
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