A Flash of Genius: Taming Electrons With Laser Precision for a 1,000,000x Faster Electronics
Researchers from FAU, the University of Rostock, and the University of Konstanz have precisely controlled electron emission from metals by superimposing two laser fields of different strengths and frequencies. This groundbreaking discovery could lead to new quantum mechanical insights and enable electronic circuits that are a million times faster than current technology.
Light is capable of releasing electrons from metal surfaces. This observation was already made in the first half of the 19th century by Alexandre Edmond Becquerel and later confirmed in various experiments, among others by Heinrich Hertz and Wilhelm Hallwachs. Since the photoelectric effect could not be reconciled with the light wave theory, Albert Einstein came to the conclusion that light must consist not only of waves, but also of particles. He laid the foundation for quantum mechanics.
have now succeeded in doing for the first time. They used a special strategy for this: Instead of just a strong laser pulse, which emits the electrons a pointy tungsten tip, they also used a second weaker laser with twice the frequency. “In principle, you have to know that with very strong laser light, the individual photons are no longer responsible for the release of the electrons, but rather the electric field of the laser,” explains Dr.
The most important field of application is light-field-driven electronics: With the proposed two-color method, the laser light can be modulated in such a way that an exactly defined sequence of electron pulses and thus of electrical signals could be generated. Dienstbier: “In the foreseeable future, it will be possible to integrate the components of our test setup – light sources, metal tip, electron detector – into a microchip.
Reference: “Tunneling electrons” by Philip Dienstbier, Lennart Seiffert, Timo Paschen, Andreas Liehl, Alfred Leitenstorfer, Thomas Fennel and Peter Hommelhoff, 26 April 2023,
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