Shear-Aligned Flexible Polarized Fluorescent Antennas for Wearable Visible Light Communications

Area of Science:

• Materials Science
• Optical Communications
• Wearable Technology

Background:

• Wearable visible light communication (VLC) systems suffer from signal crosstalk in dense multi-input multi-output configurations.
• Existing systems lack robustness against environmental factors and mechanical stress.

Purpose of the Study:

• To develop advanced flexible polarized fluorescent antennas (FPFAs) for enhanced wearable optical communication.
• To investigate the physical mechanisms behind shear-aligned halloysite nanotube structures for improved antenna performance.
• To demonstrate a robust and high-performance wearable communication system.

Main Methods:

• Fabrication of shear-aligned FPFAs using a scalable thermally assisted brush-coating induction (BCI) process.
• Investigation of "coffee-ring" phenomena and shear forces for halloysite nanotube alignment.
• Encapsulation of aligned structures in a sandwich configuration for mechanical stability and polarization preservation.
• Integration with quantum dot fluorescent conversion layers.

Main Results:

• Achieved highly ordered halloysite nanotube structures with an orientation degree of 0.89.
• Demonstrated 4.25 times higher parallel fracture strength compared to conventional designs.
• Obtained a 4.95-fold improvement in signal-to-noise ratio (SNR) across wide viewing angles and under bending.
• Achieved 85.1% transmission accuracy at 9 m, a 935% improvement over conventional methods.
• Showcased superior resilience to environmental disturbances like rain and fog.

Conclusions:

• The BCI process enables scalable fabrication of mechanically stable and highly aligned FPFAs.
• The developed FPFAs offer significant improvements in SNR and transmission accuracy for wearable VLC.
• This technology provides a robust polarization multiplexing strategy for diverse applications including healthcare, secure communication, and augmented reality.