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Crystals
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Liquid Crystals-Based Metamaterials
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Liquid Crystals-Based Metamaterials

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

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 5157

Special Issue Editors

Dr. Chia-Yi Huang

E-Mail Website
Guest Editor
Department of Applied Physics, Tunghai University, Taichung 407, Taiwan
Interests: semiconductor device; nanomaterials; energy materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Victor Reshetnyak

E-Mail Website
Guest Editor
Physics Faculty, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
Interests: liquid crystal lenses; surface and Tamm plasmons in liquid crystals; liquid crystals filled with nanoparticles; polymer dispersed liquid crystals; metamaterials based on liquid crystals; nonlinear optics of liquid crystals; photorefraction in liquid crystals

Special Issue Information

Dear Colleagues,

Liquid crystal derivatives such as liquid crystals, liquid crystal elastomers, and liquid crystal polymers have attracted much attention due to their high controllability, so they have been used to develop electrically, optically, thermally, and magnetically controllable devices. Artificial materials such as metamaterials, metasurfaces, and metalenses are widely used to manipulate frequencies, intensities, and phases of incident electromagnet waves due to their strong response to incident electromagnet waves. Therefore, artificial materials that involve liquid crystal derivatives are the candidate for fabricating high-performance and advanced devices.

Dr. Chia-Yi Huang
Prof. Dr. Victor Reshetnyak
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

  • liquid crystals
  • liquid crystal elastomers
  • liquid crystal polymers
  • metamaterials
  • metasurfaces
  • metalenses

Published Papers (2 papers)

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Research

10 pages, 3022 KiB  
Article
Optically Tunable and Thermally Erasable Terahertz Intensity Modulators Using Dye-Doped Liquid Crystal Cells with Metasurfaces
by Yi-Hong Shih, Harry Miyosi Silalahi, Ting-I Tsai, Yi-Chen Chen, Jou-Yu Su, Chia-Rong Lee and Chia-Yi Huang
Crystals 2021, 11(12), 1580; https://doi.org/10.3390/cryst11121580 - 18 Dec 2021
Cited by 4 | Viewed by 2279
Abstract
A terahertz metasurface that is imbedded into a dye-doped liquid crystal (DDLC) cell is fabricated in this work. After the metasurface-imbedded DDLC cell is irradiated with a linearly polarized pump beam, the irradiated cell is measured with a terahertz spectrometer. The irradiation of [...] Read more.
A terahertz metasurface that is imbedded into a dye-doped liquid crystal (DDLC) cell is fabricated in this work. After the metasurface-imbedded DDLC cell is irradiated with a linearly polarized pump beam, the irradiated cell is measured with a terahertz spectrometer. The irradiation of the pump beam causes the adsorption of the dye on one of the substrates of the cell, scattering incident terahertz waves and decreasing the transmittances of the terahertz metasurface at all the frequencies of its resonance spectrum. In addition, these transmittances decrease with an increase in the irradiation times of the pump beam. The adsorbed dye molecules are erased from the substrate after the cell is heated by a hot plate. The cell has similar spectra before the irradiation of the pump beam and after the heating of the hot plate. The aforementioned results reveal that the metasurface-imbedded DDLC cell is an optically tunable and thermally erasable terahertz intensity modulator. Therefore, this cell has the potential in developing intensity attenuators for terahertz imaging, frequency isolators for terahertz telecommunication, and spatial light modulators for terahertz information encryption and decryption. Full article
(This article belongs to the Special Issue Liquid Crystals-Based Metamaterials)
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10 pages, 3501 KiB  
Article
Synthesis, Self-Assembly and Photoresponsive Behavior of Liquid Crystals Based on Azobenzene
by Yaming Wu, Yuhai Liu, Jianxiang Chen and Runmiao Yang
Crystals 2021, 11(12), 1560; https://doi.org/10.3390/cryst11121560 - 14 Dec 2021
Viewed by 2215
Abstract
A new amphiphilic surfactant (C4-Azo-C5-HDA) was formed by liquid crystals (LCs) based on azobenzene, whose structures were characterized by 1H-NMR spectroscopy. The reversible hydrogelation upon changes in temperature and light exposure was also studied. Under the irradiation of UV light, the trans-isomer [...] Read more.
A new amphiphilic surfactant (C4-Azo-C5-HDA) was formed by liquid crystals (LCs) based on azobenzene, whose structures were characterized by 1H-NMR spectroscopy. The reversible hydrogelation upon changes in temperature and light exposure was also studied. Under the irradiation of UV light, the trans-isomer of C4-Azo-C5-HDA rapidly photoisomerized to the cis-isomer, resulting in rapid disruption of the gel. The thermotropic liquid crystal behavior of the gelator was investigated via Differential Scanning Calorimetry (DSC) and Polarizing Optical Microscopy (POM). The biocompatibility experiment of multi-stimulus response of the liquid crystal provides a potential driving force for the development of biomaterials. Full article
(This article belongs to the Special Issue Liquid Crystals-Based Metamaterials)
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