Wireless Electricity: Power-by-Light Systems
Scientists successfully transmitted electricity through air using ultrasonic sound waves and laser beams.
Finland is positioning itself at the forefront of a wireless energy revolution, with researchers from the University of Helsinki and the University of Oulu pioneering methods to move electricity without physical cables.
One of the most striking developments involves using high-intensity ultrasonic sound waves to create invisible pathways through the air, effectively guiding electrical sparks along a controlled route.
While currently in the experimental phase, this ‘acoustic wire’ technology could eventually enable contactless electrical connections and smart interfaces that function entirely without plugs or traditional wiring.
Beyond sound-guided energy, Finnish innovation is also leveraging light and radio frequencies to solve complex power challenges. The private sector is developing ‘power-by-light’ systems that utilize high-powered lasers to transmit electricity to remote receivers, providing critical galvanic isolation for hazardous environments like nuclear plants and high-voltage stations. Simultaneously, advancements in radio-frequency harvesting are turning ambient waves into ‘Wi-Fi for power,’ potentially eliminating the need for millions of disposable batteries in low-power IoT sensors. Together, these technologies signal a shift toward a more flexible, cable-free infrastructure for global industry.
source: University of Helsink. Wireless Electricity Transmission: Breakthroughs in Acoustic and Laser-Based Power. University of Helsinki News.
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