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Crystals
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Liquid-Crystal Polarization Gratings Volume II
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Liquid-Crystal Polarization Gratings Volume II

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

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 4133

Special Issue Editors

Dr. Yishi Weng

E-Mail Website
Guest Editor
School of Electronic Science and Engineering, Southeast University, Nanjing, China
Interests: near-eye displays; polarization gratings; holographic optical elements
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jianghao Xiong

E-Mail Website
Guest Editor
School of Optics and Photonics, Beijing Institute of Technology, Beijing, China
Interests: liquid crystal; polarization holograms; 3D displays; AR/VR optics
Prof. Dr. Chaoping Chen

E-Mail Website
Guest Editor
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, China
Interests: augmented reality; virtual reality; near-eye displays; holographic displays; liquid crystal devices

Special Issue Information

Dear Colleagues,

Liquid-crystal polarization gratings (LCPGs) are attracting wide interest in both the liquid crystal and optics fields due to their intriguing formation process, unique optical properties, and potential applications in emergent wearable devices, such as augmented/virtual reality headsets.

Depending on the formation process, LCPGs can be categorized into two major types. The first method utilizes polarization interference to pattern a thin photo-alignment layer, and the subsequently coated/filled liquid crystals can self-align into gratings following the patterned surface. The second method utilizes the photocycloaddition of cinnamate moieties or similar processes to record the volumetric polarization field during polarization interference into the body of the material and then subject it to an annealing process to induce birefringence. The behaviors of LCPGs are highly dependent on materials and interference patterning and processing. In the simplest case, linear gratings can be formed, while complicated, exotic gratings may also be generated. In the past, a significant amount of effort has been focused on liquid crystal research on electrically switchable non-polymer liquid crystal materials for display, phase modulation, or shutter applications. Polymerizable materials, molecular kinematics, and the consequent optical properties for both types of LCPGs are comparatively still an uncharted territory, with new challenges and opportunities.

The unique properties of LCPGs open new possibilities in various fields, such as imaging, display, beam-shaping, beam-steering, communication, sensing, spectroscopy, AR/VR, etc. With new optical components, it is an exciting time to explore novel optical systems that tackle these challenges and rethink classic optical designs.

This Special Issue of Crystals serves to provide a platform for researchers to report results and findings in liquid-crystal or liquid-crystal-polymer LCPGs in the aspects of material, processing, patterning, polymerization, molecular kinematics, optical properties, and their applications.

Potential topics include but are not limited to:

  • Materials for LCPGs;
  • Interplay between materials and LCPGs structures;
  • Effect of processing and patterning on LCPGs;
  • Optical characteristics of LCPGs;
  • Novel structures of LCPGs;
  • Applications of LCPGs;
  • Optical systems based on LCPGs.

Dr. Yishi Weng
Prof. Dr. Jianghao Xiong
Prof. Dr. Chaoping Chen
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-crystal gratings
  • polarization volume gratings
  • polarization gratings
  • near-eye displays

Related Special Issue

Published Papers (2 papers)

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Research

12 pages, 2388 KiB  
Article
Off-Axis Polarization Volume Lens for Diffractive Waveguide
by Lixuan Zhang, Yishi Weng, Ran Wei, Chuang Wang, Yuchen Gu, Chenyu Huang and Yuning Zhang
Crystals 2023, 13(3), 390; https://doi.org/10.3390/cryst13030390 - 24 Feb 2023
Cited by 1 | Viewed by 1326
Abstract
In augmented reality diffractive waveguide technology, the light field needs to be collimated before being transmitted into the diffractive waveguide. Conventional schemes usually require additional collimating optics to collimate the light from the micro-image source and guide it into the waveguide in-coupling elements. [...] Read more.
In augmented reality diffractive waveguide technology, the light field needs to be collimated before being transmitted into the diffractive waveguide. Conventional schemes usually require additional collimating optics to collimate the light from the micro-image source and guide it into the waveguide in-coupling elements. In order to meet the needs of head-mounted devices and further miniaturize the equipment, this paper proposes a waveguide device that combines collimation and coupling by using a reflective polarization volume lens (PVL). A related model is also established and simulated to calculate the diffraction and transmission characteristics of the PVL element, and is then improved to fit the experiment. The diffraction lens studied in this paper has high diffraction efficiency with a large off-axis angle, which can fold the optical path and reduce considerably the volume of the optical system when applied to the waveguide system. Full article
(This article belongs to the Special Issue Liquid-Crystal Polarization Gratings Volume II)
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10 pages, 5847 KiB  
Article
A Study of the Field of View Performance for Full-Color Waveguide Displays Based on Polarization Volume Gratings
by Yuchen Gu, Yishi Weng, Yuning Zhang, Chuang Wang, Ran Wei, Wei Wang, Nan Lin, Lixuan Zhang and Baoping Wang
Crystals 2022, 12(12), 1805; https://doi.org/10.3390/cryst12121805 - 12 Dec 2022
Cited by 1 | Viewed by 2418
Abstract
Multilayer waveguide structures can realize full-color AR displays of diffractive waveguides. This paper discusses the field-of-view characteristics of a waveguide system with a multilayer structure when polarization volume gratings (PVG) are applied as couplers to achieve a full-color display. The effects of the [...] Read more.
Multilayer waveguide structures can realize full-color AR displays of diffractive waveguides. This paper discusses the field-of-view characteristics of a waveguide system with a multilayer structure when polarization volume gratings (PVG) are applied as couplers to achieve a full-color display. The effects of the refractive index and period parameter of PVG-couplers on the field of view are investigated. In addition, a PVG waveguide sample with an optimized design is prepared. The experimental results show that the designed waveguide system can achieve a full-color AR display with a 45° diagonal field of view, which verifies the feasibility of the design and provides a potential solution for AR color waveguide display applications. Full article
(This article belongs to the Special Issue Liquid-Crystal Polarization Gratings Volume II)
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