Novel visible light communication encryption technology uses chiral nanoparticles

Phys.org  October 10,2024
Although recent advancements have been made in active emission or passive conversion of polarized light through solution-processed nanomaterials or metasurfaces, the design paths usually encounter limitations. To address these challenges researchers in the Republic of Korea integrated the spatiotemporal modulation of the LED device, the precise control and efficient polarization emission, and the programmable patterning/positioning using 3D printing. They showed high degree of polarization for both linearly and circularly polarized emission from ultrathin inorganic nanowires and quantum nanorods due to the shear-force-induced alignment effect during the protruding of printing filaments. Real-time polarization modulation was obtained through the programming of the on-off state of each LED pixel. The output polarization states could be encoded by an ordered chiral plasmonic film. According to the researchers their device provides a platform for multiplexing spatiotemporal polarization information, enabling visible light communication with elevated level of physical layer security and multifunctional encrypted displays that can encode both 2D and 3D information. read more. Open Access TECHNICAL ARTICLE 

Real-time modulation of the output polarization states. Credit: Nature Communications volume 15, Article number: 8257, 27 September 2024 

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