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Lightsaber-like plasma antenna uses laser-ionized air to transmit radio waves

Phys.org • October 5, 2026 • science

Key Points:

Researchers at North Carolina State University have developed a laser-induced plasma beam antenna capable of transmitting radio waves, as detailed in the IEEE Journal of Microwaves.
The plasma antenna is tunable by adjusting the laser parameters, allowing control over its length and frequency range, and can potentially steer signals by changing the laser beam direction.
A novel contactless antenna feed using a metal ring capacitor enables the plasma filament to transmit radio signals without physical connections.
This technology offers customizable antennas without complex mechanical parts, with promising applications in space exploration and satellites, especially in low Earth orbit where plasma formation is feasible.
The research marks the first demonstration of plasma-filament antennas functioning as transmitters, opening avenues for further performance enhancements.

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