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Crystals
Special Issues
Volume Holographic Optical Element (VHOE)
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Volume Holographic Optical Element (VHOE)

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

Deadline for manuscript submissions: closed (31 July 2020) | Viewed by 3578

Special Issue Editors

Prof. Dr. Wei-Chia Su

E-Mail Website
Guest Editor
Graduate Institute of Photonics, National Changhua University of Education, Changhua 50007, Taiwan
Interests: liquid-crystal-based holographic material; polarization grating based on LCs; LC devices; holographic optical elements; holographic 3D display; holographic storage
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ching-Cherng Sun

E-Mail Website
Guest Editor
Department of Optics and Photonics, National Central University Taiwan, Chung-Li, Taiwan
Interests: lighting optics; imaging/nonimaging design; LED packaging; optical system design; volume holography; 3D indoor mapping
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Holography was invented in 1948, when Dr. Dennis Gabor announced the result of his research in recording and reconstructing a specific wavefront. In the 1960s, much research was touching on volume holography, and as a result, more and more superior properties were discovered. From then on, volume holography has been not only a new theoretical topic but also a new approach in providing novel solutions to an optical/photonic device or system. In 2004, Optical Engineering launched the first issue on so-called volume holographic optical elements (VHOE), which increased its impact on modern optical/photonic research in providing superior characteristics, including the narrow band of spatial/temporal filtering, the flexible design of holographic multiplexing, higher diffraction efficiency, compact or slim component size, etc. However several tough tasks remain: Precise calculation or simulation of a strong VHOE, fabrication of a VHOE, and a stable and long-life VHOE, even when VHOEs have been extensively adopted in various applications.

This Special Issue on VHOE aims to collect novel and interesting research based on VHOE technology. The potential topics include, but are not limited to:

  1. Theoretical calculation or simulation of diffraction efficiency of a VHOE
  2. New VHOE recording medium
  3. New VHOE applications
  4. New VHOE structures
  5. VHOE for optical communication
  6. VHOE for optical sensing
  7. VHOE for image processing
  8. VHOE for spatial filtering
  9. VHOE for wavelength filtering
  10. Multi functions with use of VHOE
  11. Dynamic VHOE
  12. Long-life VHOE

Prof. Dr. Wei-Chia Su
Prof. Dr. Ching-Cherng Sun
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 2100 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.

Published Papers (1 paper)

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Research

9 pages, 1787 KiB  
Article
A Facile Fabrication Route of Poly(Ethylene Glycol Phenyl Ether Acrylate) Photopolymers with Efficient Optical Response for Holographic Storage
by Fang-Yong Lee, Xin-Jin Wang, Wei-Hung Su and Tzu-Chien Hsu
Crystals 2020, 10(10), 935; https://doi.org/10.3390/cryst10100935 - 14 Oct 2020
Viewed by 2191
Abstract
A series of photopolymers based on ethylene glycol phenyl ethyl arylate (EGPEA) monomers and poly(methyl methacrylate) (PMMA) matrix with varying initiator concentrations and sample thicknesses have been synthesized and their optical performance characterized in this study. The advantages of lowering the initiator concentration, [...] Read more.
A series of photopolymers based on ethylene glycol phenyl ethyl arylate (EGPEA) monomers and poly(methyl methacrylate) (PMMA) matrix with varying initiator concentrations and sample thicknesses have been synthesized and their optical performance characterized in this study. The advantages of lowering the initiator concentration, including a rather short initiation time within a few seconds; a sharp rising optical response; and a stable saturated diffraction efficiency are demonstrated. The variation in the diffraction efficiency and response time with the exposure energy under various sample thickness and initiator concentrations is examined; a diffraction efficiency as high as 80% and a relatively short response time of 12–39 s are attainable. The dependence of the normalized optical parameter “sensitivity” on the exposure time is depicted, and the peak value of S ranges vastly from about 0.2 to 1.2 × 104 cm/J within a period of 15 s or so, with a maximum value of nearly 1.2 × 104. Favorable evidence of low initiator concentration can further be found when the dependence of the saturated diffraction efficiency with the exposure energy is examined. The data from this study using a low initiator concentration cover a range of exposure energy from 100 to 800 mJ/cm2 and a saturated diffraction efficiency from about 15% to 80%. The successful image reconstruction of 6-membered-ring metal nuts on a hologram based on this EGPEA/PMMA photopolymer system using a reflective holographic recording setup is demonstrated to verify its applicability to holographic storage. Full article
(This article belongs to the Special Issue Volume Holographic Optical Element (VHOE))
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