Special Issue "Liquid-Crystal Polarization Gratings"

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

Deadline for manuscript submissions: 1 February 2021.

Special Issue Editors

Dr. Yun-Han Lee
Guest Editor
Facebook Reality Labs, United StatesFacebook Reality Labs, US
Interests: liquid crystals; polarization volume gratings; AR/VR devices
Dr. Guanjun Tan
Guest Editor
Apple Inc., USA
Interests: AR/VR Optics; display optics; polarization volume gratings
Dr. Yishi Weng

Guest Editor
School of Electronic Science and Engineering, Southeast University
Interests: near-eye displays; polarization gratings; holographic optical elements

Special Issue Information

Dear Colleagues,

Liquid-crystal polarization gratings (LCPGs) are attracting wide interests in both liquid-crystals and optics fields due to its 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 process to record the volumetric polarization field during polarization interference into the body of the material, and then subject to annealing process to induce birefringence. The behaviors of LCPGs are highly dependent on materials, interference patterning and processing. In the simplest case, linear gratings can be formed, while complicated, exotic gratings may also be generated. In the past, significant amount of efforts had been put into liquid crystal researches 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 type of LCPGs are comparatively still an uncharted territory with new challenges and opportunities.

The unique properties of LCPGs open new possibilities in various field such as imaging, display, beam-shaping, beam-steering, communication, sensing, spectroscopy, AR/VR etc. With new optical component, it is an exciting time to explore novel optical systems that tackles these challenges and re-think 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. Yun-Han Lee
Dr. Guanjun Tan
Dr. Yishi Weng
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 papers will be 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 1800 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.


  • Liquid-crystal gratings
  • Polarization volume gratings
  • Polarization gratings
  • Near-eye displays

Published Papers (1 paper)

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Open AccessReview
Polarization Volume Gratings for Near-Eye Displays and Novel Photonic Devices
Crystals 2020, 10(7), 561; https://doi.org/10.3390/cryst10070561 - 01 Jul 2020
Cited by 4
Liquid crystal-based reflective polarization volume grating (PVG), also known as a linear Bragg–Berry phase optical element or a member of volume Bragg gratings (VBGs), is a functional planar structure with patterned orientation of optical axis. Due to the strong polarization selectivity, nearly 100% [...] Read more.
Liquid crystal-based reflective polarization volume grating (PVG), also known as a linear Bragg–Berry phase optical element or a member of volume Bragg gratings (VBGs), is a functional planar structure with patterned orientation of optical axis. Due to the strong polarization selectivity, nearly 100% diffraction efficiency, large diffraction angle, and simple fabrication process, PVGs have found potential applications in novel photonic devices and emerging near-eye displays. In this review paper, we describe the operation principles, discuss the optical properties, present the fabrication methods, and provide promising applications of PVGs for near-eye displays and novel photonic devices. Full article
(This article belongs to the Special Issue Liquid-Crystal Polarization Gratings)
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