Re-configurable intelligent surface-based VLC receivers using tunable liquid-crystals : the Concept

Ndjiongue, Alain R. and Ngatched, Telex M. N. and Dobre, Octavia A. and Haas, Harald (2021) Re-configurable intelligent surface-based VLC receivers using tunable liquid-crystals : the Concept. Journal of Lightwave Technology, 39 (10). pp. 3193-3200. ISSN 0733-8724 (https://doi.org/10.1109/JLT.2021.3059599)

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Abstract

Visible light communication (VLC) enables access to huge unlicensed bandwidth, a higher security level, and no radio frequency interference. With these advantages, VLC emerges as a complementary solution to radio frequency communications. VLC systems have primarily been designed for indoor scenarios with typical transmission distances between 2 and 5 m. Different designs would be required for larger distances. This article proposes for the first time, the use of a liquid crystal (LC)-based re-configurable intelligent surface (RIS) for improving the VLC signal detection and transmission range. An LC-based RIS presents multiple advantages, including the tunability of its photo-refractive parameters. Another advantage is its light amplification capabilities when under the influence of an externally applied field. In this article, we analyze an LC-based RIS structure to amplify the detected light and improve the VLC signal detection and transmission range. Results show that mixing LC with 4 to 8 wt% concentration of a dye such as the terthiophene (3T-2 MB) improves the VLC transmission range of about 0.20 to 1.08 m. This improvement can reach 6.56 m if we combine 8 wt% concentration of 3T-2 MB and 0.1 wt% concentration of trinitrofluorenone.

  • Item type:Article
    ID code:76646
    Dates:
    Date
    Event
    15 May 2021
    Published
    16 February 2021
    Published Online
    12 February 2021
    Accepted
    Notes:© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:03 Jun 2021 09:35
    Last modified:02 Dec 2024 01:24
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/76646
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