Be careful taking a deep breath outside today. You might accidentally inhale someone’s radio antenna.
It sounds like a cartoon gag, but engineers just proved it in a lab.
They just built a working antenna out of thin air. A high-energy laser turns an invisible column of atmosphere into a conductor that broadcasts radio signals.
To feed it without touching it, they shoot the beam through a copper ring, jumping waves across empty space.
Turn off the laser, and the antenna dissolves back into breathable air. https://ieeexplore.ieee.org/document/11674160
🌟 How a “Laser Antenna” Works.
Normally, antennas rely on metal conductors because their free electrons can carry and broadcast electromagnetic signals. In this study, scientists used an intense beam of light to ionize the air, creating a plasma filament (a glowing string of charged gas).
Because this filament has mobile electrons along its outer edges, it mimics the behavior of a traditional metal wire, giving it all the basic ingredients needed to act as an antenna.