TY - JOUR
T1 - Re-configurable intelligent surface-based VLC receivers using tunable liquid-crystals
T2 - the Concept
AU - Ndjiongue, Alain R.
AU - Ngatched, Telex M. N.
AU - Dobre, Octavia A.
AU - Haas, Harald
N1 - © 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.
PY - 2021/5/15
Y1 - 2021/5/15
N2 - 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.
AB - 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.
KW - Beer-Lambert law
KW - dye-doped and polymer liquid crystals
KW - radiative transfer equation (RTE)
KW - re -configurable intelligent surface (RIS)
KW - terthiophene (3T-2 MB)
KW - trinitrofluorenone (TNF)
KW - visible light communication (VLC)
KW - VLC transmission range expansion
UR - https://arxiv.org/abs/2101.02369
U2 - 10.1109/JLT.2021.3059599
DO - 10.1109/JLT.2021.3059599
M3 - Article
AN - SCOPUS:85100914768
SN - 0733-8724
VL - 39
SP - 3193
EP - 3200
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 10
ER -