University of Michigan Researchers Steer Electrons With 2 Laser Colors, No Power Source Needed
Updated
Updated · Newswise · Jul 21
University of Michigan Researchers Steer Electrons With 2 Laser Colors, No Power Source Needed
2 articles · Updated · Newswise · Jul 21
Summary
University of Michigan researchers built a semiconductor device that drives electrons with laser light alone, then steers that current into a narrow beam by rotating the light’s polarization.
Two phase-coherent colors of light create quantum interference between absorption pathways, boosting electrons moving one way while canceling motion in other directions.
The team says the result goes beyond earlier light-only current experiments because the light not only switches current on but also aims it—an effect predicted as an “electron lighthouse.”
Published in Physical Review Letters, the NSF-backed work was fabricated at U-M’s Lurie Nanofabrication Facility and could inform future sensing, imaging, telecommunications and higher-capacity signal handling.
How will this 'electron lighthouse' steer the future of the booming $14 billion quantum photonics market?
As quantum experts meet at Purdue today, could this Michigan discovery be the key to practical, room-temperature quantum devices?
The device is 'powerless,' but its lasers are not. What is the technology's true energy cost versus traditional electronics?
"Electron Lighthouse: Laser-Driven Electron Steering in Semiconductors Ushers in a New Era of Quantum Control"
Overview
The University of Michigan has introduced the 'electron lighthouse,' a breakthrough that uses only laser light to steer electrons in a semiconductor, eliminating the need for electrical power. This innovation, published in 2026, relies on quantum interference control, where two carefully synchronized laser pulses create specific light wave patterns. These patterns guide the movement of electrons with high precision, opening new possibilities for faster, more efficient electronic devices and advanced quantum technologies. The discovery marks a major step forward in controlling electron flow, promising significant impacts on future data storage, communication, and quantum computing.