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Photo-Responsive Materials and Devices

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

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 4186

Special Issue Editors


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Guest Editor
Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
Interests: polarization grating; pancharatnum berry phase; liquid crystal; nonlinear optics; organic materials

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Guest Editor
Department of Applied Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
Interests: photo-reactive polymer liquid crystal; photo-alignment

Special Issue Information

Dear Colleagues,

We are inviting submissions to the Special Issue on Photo-responsive Materials and Devices.

Photo-responsive materials have the ability to form novel optical devices because of their unique properties, such as photo-induced birefringence, photo-mobility, and nonlinear effects under light illumination. Based on these properties, many kinds of functionalized optical devices have been reported, for example, polarization hologram, anisotropic diffraction grating, and Pancharatnum–Berry phase lens. Since the design flexibility and performance of the optical systems strongly depend on the functions of optical components, the synthesis of new photo-responsive materials and the development of highly functionalized optical devices based on material properties will bring innovations in photonics.

In this Special Issue, we invite submissions related to the photo-reactive materials, such as photopolymer, photosensitive liquid crystal, photoalignment film, and its applications for developing optical devices. Both theoretical and experimental studies are welcome, as well as comprehensive review and survey papers.

Prof. Dr. Hiroshi Ono
Prof. Dr. Nobuhiro Kawatsuki
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. 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

  • Photoreactive materials
  • Liquid crystals
  • Photopolymer
  • Holograms
  • Photoalignment
  • Diffractive elements
  • Pancharatnum–berry phase
  • Optical switch
  • Polarization control
  • Optical devices

Published Papers (3 papers)

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Research

13 pages, 4556 KiB  
Article
The Effect of a Topcoat with Amorphous Polymer Layers on the Mesogen Orientation and Photoalignment Behavior of Side Chain Liquid Crystalline Polymer Films
by Mari Furuichi, Mitsuo Hara, Shusaku Nagano and Takahiro Seki
Appl. Sci. 2022, 12(19), 9410; https://doi.org/10.3390/app12199410 - 20 Sep 2022
Cited by 3 | Viewed by 1397
Abstract
The mesogen orientations of liquid crystals are sensitive to the nature of the contacting surface. For side chain liquid crystalline polymer (SCLCP) films, most investigations have been conducted for thin films formed on a solid substrate surface such as glass, quartz and metal [...] Read more.
The mesogen orientations of liquid crystals are sensitive to the nature of the contacting surface. For side chain liquid crystalline polymer (SCLCP) films, most investigations have been conducted for thin films formed on a solid substrate surface such as glass, quartz and metal oxides, and little knowledge has been accumulated for SCLCP films whose top surface is covered by amorphous polymers. This work presents the effect of a topcoat with amorphous polymers placed on SCLCP films on the mesogen orientation and photoalignment behavior. When an SCLCP film that adopts a homeotropic mesogen orientation is covered with a glass plate or polymer layer, the mesogens turns to a random planar orientation. This planar orientation is favorable for efficient in-plane photoalignment by irradiation with linear polarized light. An in-plane order parameter exceeding 0.5 is readily obtained. Unexpectedly, a significant stabilization of the liquid crystal phase by over 10 °C is observed above the isotropization temperature of the SCLCP. These fundamental sets of knowledge should be significant in the fabrication of various polymer LC devices. Full article
(This article belongs to the Special Issue Photo-Responsive Materials and Devices)
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9 pages, 2326 KiB  
Article
High-Efficiency Characterization of Optical Vortices with Arbitrary State of Polarization Using Straight-Line and Parabolic-Line Polarization Gratings
by Moritsugu Sakamoto, Tomoki Yayama, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki and Hiroshi Ono
Appl. Sci. 2022, 12(17), 8768; https://doi.org/10.3390/app12178768 - 31 Aug 2022
Viewed by 1155
Abstract
An optical system consisting of a straight-line polarization grating (SPG) and two parabolic-line polarization gratings (PPGs) is presented for the characterization of optical vortices (OVs) with arbitrary states of polarization (SoPs). The PPG is capable of converting an OV with a specific SoP [...] Read more.
An optical system consisting of a straight-line polarization grating (SPG) and two parabolic-line polarization gratings (PPGs) is presented for the characterization of optical vortices (OVs) with arbitrary states of polarization (SoPs). The PPG is capable of converting an OV with a specific SoP into a bright bar-like spot with 100% efficiency. The number of dark lines and their orientation respectively correspond to the magnitude and sign of topological charge (TC) of the incident OV, thereby enabling characterization of OVs with high efficiency. Furthermore, on combining an SPG with PPGs, the present system can characterize the TC of incident OVs regardless of their SoP. The feasibility of the system was demonstrated in experiments using gratings fabricated by applying the photoalignment method and employing films of a photo-crosslinkable polymer liquid crystal. The experimentally obtained efficiency is 70.2%. We furthermore demonstrate the system’s capability to characterize polarization vortices. Full article
(This article belongs to the Special Issue Photo-Responsive Materials and Devices)
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9 pages, 2039 KiB  
Article
Photoinduced Reorientation and Polarized Fluorescence of a Photoalignable Liquid Crystalline Polymer
by Hiroki Furukawa, Hinano Yamaguchi, Mizuho Kondo, Moritsugu Sakamoto, Tomoyuki Sasaki, Hiroshi Ono and Nobuhiro Kawatsuki
Appl. Sci. 2022, 12(13), 6440; https://doi.org/10.3390/app12136440 - 24 Jun 2022
Cited by 1 | Viewed by 1174
Abstract
Thermally stimulated photoinduced reorientation of liquid crystalline (LC) polymethacrylate composed of a phenyl benzoate mesogen connected with N-benzylideneaniline (NBA2) end moiety exhibits a significant molecular reorientation (D > 0.7) when the film is exposed to linearly polarized 313 nm light and [...] Read more.
Thermally stimulated photoinduced reorientation of liquid crystalline (LC) polymethacrylate composed of a phenyl benzoate mesogen connected with N-benzylideneaniline (NBA2) end moiety exhibits a significant molecular reorientation (D > 0.7) when the film is exposed to linearly polarized 313 nm light and subsequently annealed in the LC temperature range of the material. Hydrolysis of the NBA2 end moieties yields an oriented mesogen with phenylamine moieties without distorting the oriented structure. In situ condensation of 2-hydroxybenzaldehyde derivatives and phenylamine moieties yields oriented N-salicylideneaniline side groups. The resultant film displays a polarized fluorescence with a polarization ratio up to 3.4. Full article
(This article belongs to the Special Issue Photo-Responsive Materials and Devices)
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