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Crystals
Special Issues
Optical Crystals and Their Applications in Optical Devices
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Optical Crystals and Their Applications in Optical Devices

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

Deadline for manuscript submissions: closed (23 February 2024) | Viewed by 3345

Special Issue Editor

Dr. Tae-hoon Choi

E-Mail Website
Guest Editor
Korea Automotive Technology Institute, Cheonan 31214, Republic of Korea
Interests: optical materials; light-control materials; optical devices; optoelectronic devices; display materials

Special Issue Information

Dear Colleagues,

Liquid crystals and optical crystals are materials whose optical properties can be controlled by applying external energies, such as electricity, magnetism, light, heat, etc. These optical materials are becoming very interesting in various application fields because they can control optical characteristics including color, transmission, reflection, etc. To accelerate the potential applications, various works have focused on the optical, physical, and chemical characteristics, analyzing them through theory, experiments, and simulations. The aim of this Special Issue is to present breakthrough discoveries and fundamental research on advanced optical materials, photonics, displays, electronics devices, and more. This covers all areas of engineering, physical and chemical sciences, and applications to optical and display devices.

Dr. Tae-hoon Choi
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. 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
  • optical and photonic crystals
  • advanced optical materials
  • display materials
  • optical devices
  • optoelectronic devices
  • light-control materials
  • optical films
  • application of advanced optical materials

Published Papers (3 papers)

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Research

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9 pages, 2423 KiB  
Article
Energy-Efficient Liquid Crystal Smart Window with a Clear View
by Chan-Heon An, Tae-Hoon Choi and Seung-Won Oh
Crystals 2023, 13(10), 1464; https://doi.org/10.3390/cryst13101464 - 7 Oct 2023
Viewed by 1288
Abstract
In this study, we enhance the angular-selective light absorption capabilities of guest–host liquid crystal (GHLC) cells by introducing a novel design featuring a uniform lying helix (ULH) structure. Previously GHLC cells, predominantly vertically aligned cells absorbed obliquely incident light but compromised x-direction [...] Read more.
In this study, we enhance the angular-selective light absorption capabilities of guest–host liquid crystal (GHLC) cells by introducing a novel design featuring a uniform lying helix (ULH) structure. Previously GHLC cells, predominantly vertically aligned cells absorbed obliquely incident light but compromised x-direction visibility. In stark contrast, our ULH-based design allows incident light to seamlessly traverse transmittance in both z- and x-directions while efficiently obstructing oblique incident light in the y-direction. Our innovative ULH-based GHLC cell achieves an impressive optical performance. Specifically, it attains a substantial transmittance rate of 56.7% in the z-direction. Furthermore, in oblique views encompassing both the x- and y-directions, it maintains competitive transmittance rates of 44.2% and 29.5%, respectively. This strategic design not only ensures clear and unobstructed views for building occupants in the z- and x-directions but also contributes significantly to energy conservation by preventing oblique incident light from penetrating, thus reducing cooling requirements. Our ULH-based GHLC cell represents a breakthrough in smart window technology, offering an elegant solution to the challenge of balancing energy efficiency and occupant comfort in architectural settings. This advancement holds promising implications for sustainable building designs by enhancing indoor environmental quality while mitigating energy consumption for cooling, ultimately redefining the potential of smart windows in contemporary architecture. Full article
(This article belongs to the Special Issue Optical Crystals and Their Applications in Optical Devices)
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Review

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14 pages, 592 KiB  
Review
Photonic Devices with Multi-Domain Liquid Crystal Structures
by Aleksey Kudreyko, Vladimir Chigrinov, Kristiaan Neyts, Denis Chausov and Arina Perestoronina
Crystals 2024, 14(6), 512; https://doi.org/10.3390/cryst14060512 - 28 May 2024
Viewed by 290
Abstract
Photoalignment by azo dye nanolayers can provide high alignment quality for large-area liquid crystal devices. Application of this technology to active optical elements for signal processing and communications is a hot topic of photonics research. In this article, we review recent demonstrations and [...] Read more.
Photoalignment by azo dye nanolayers can provide high alignment quality for large-area liquid crystal devices. Application of this technology to active optical elements for signal processing and communications is a hot topic of photonics research. In this article, we review recent demonstrations and performance of liquid crystal photonic devices, discuss the advantages of the proposed technology, and identify challenges and future prospects in the research field of photoaligned multi-domain liquid crystal structures. We believe that the developments discussed here can provide directions for future research and potential opportunities for applications of liquid crystal devices based on multi-domain photoalignment. Full article
(This article belongs to the Special Issue Optical Crystals and Their Applications in Optical Devices)
17 pages, 2845 KiB  
Review
Development of the 2.7 μm to 3 μm Erbium-Doped Laser
by Guanghui Liu, Di Gu, Jingliang Liu, Yan Fang, Jiaqi Liu, Zhaoyang Li, Kuofan Cui and Xinyu Chen
Crystals 2023, 13(10), 1471; https://doi.org/10.3390/cryst13101471 - 10 Oct 2023
Viewed by 1269
Abstract
The 3 μm wavelength band laser is located on the strong absorption peak of water and the atmospheric transmission window. The 3 μm laser with high single pulse energy is used in medical treatment for cutting soft tissues and bones during surgery. It [...] Read more.
The 3 μm wavelength band laser is located on the strong absorption peak of water and the atmospheric transmission window. The 3 μm laser with high single pulse energy is used in medical treatment for cutting soft tissues and bones during surgery. It is used as a pump source for optical parametric oscillators, and Fe lasers can realize 3~5 μm or 8~14 μm laser output, which has an irreplaceable role in certain areas (e.g., optoelectronic countermeasures, LIDAR, atmospheric monitoring, etc.). Commercial semiconductor-pumped Er lasers are capable of achieving 3 μm laser output of 600 mJ with the maturation of a 970 nm semiconductor laser. The conversion efficiency is significantly improved. However, the energy is lower than a flash-lamp-pumped Er laser. There are still serious crystal thermal effects and an inefficient conversion process. In this paper, the energy-level systems of 3 μm Er-doped lasers are discussed. A summary of the current state of research on Er lasers using different matrices and the commercialization of Er-doped lasers with wavelengths ranging from 2.7 μm to 3 μm is also provided. Several technical means are given to enhance laser performance. Furthermore, the development of Er-doped solid-state lasers with wavelengths between 2.7 and 3 μm is envisaged in the near future. Full article
(This article belongs to the Special Issue Optical Crystals and Their Applications in Optical Devices)
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