A research team led by Professor Huizhu Hu from the Zhejiang University and Zhejiang Lab has developed a groundbreaking low-frequency receiving antenna using optically levitated nanoparticles , achieving a near 10,0000-fold reduction in size compared to conventional solutions. Published in PhotoniX on January 29, 2025, this innovation aims to address long-standing challenges in miniaturizing antennas for critical low-frequency (LF) communication scenarios such as underwater exploration, underground sensing, and ionospheric waveguides.
Why It Matters
Low-frequency wireless signals (30–300 kHz) excel in long-range transmission, penetration through obstacles, and anti-interference capabilities. However, traditional antennas face a fundamental trade-off: smaller size severely compromises sensitivity . Existing solutions, like magnetoelectric coupling antennas, are limited to centimeter-scale dimensions due to their reliance on resonant frequency inversely proportional to antenna size.
How It Works
The team’s nano-antenna leverages laser-trapped silica nanoparticles (143 nm diameter) levitated in a high vacuum. Key advancements include:
Technical Highlights
Current Limitations & Future Prospects
While the nano-antenna’s sensitivity remains 3–4 orders lower than conventional designs, its nanoscale size and tunability offer unique advantages in extreme environments (e.g., deep-sea or confined spaces). Future work will focus on:
Expert Perspective
“This fascinating paper considers the use of a levitated nanoparticle as a compact antenna for signals communicated as an electric field.” commented a PhotoniX reviewer.
Learn More
Full paper: Optically levitated nanoparticles as receiving antennas for low frequency wireless communication
Journal: PhotoniX
PhotoniX
News article
Not applicable
Optically levitated nanoparticles as receiving antennas for low frequency wireless communication
29-Jan-2025
no conflict-of-interest statement