Researchers at the University of Ottawa have made a breakthrough in understanding ionization, the process by which atoms lose electrons and become charged particles.
Ionization plays a key role in phenomena like lightning, plasma TVs, and the northern lights, but until now, its control has been limited. The new study proves otherwise.
Researchers controlled ionization using optical vortex beams, which carry angular momentum. This breakthrough, achieved at uOttawa’s Advanced Research Complex, could improve imaging and particle acceleration technologies.
By adjusting the properties of these light beams, including a “null intensity region,” the researchers achieved selective ionization and introduced a new concept called optical dichroism.
Generating strong magnetic fields rapidly using laser pulses
Their work showed, for the first time, that ionization rates can depend on light’s angular momentum. This could lead to ways to control how electrons behave, with potential applications in imaging, quantum computing, and material studies.
“This discovery proves advanced laser technologies can lead to groundbreaking insights in science and technology,” said Professor Bhardwaj.
These findings, which involve a groundbreaking method for controlling electrons at the quantum level, are expected to potentially revolutionize medical imaging, accelerate computing, and advance materials research.
Key findings:
- The first demonstration of ionization depends on the properties of light beams carrying angular momentum.
- Enhanced control over ionization processes could lead to advancements in imaging techniques beyond current limitations.
- A new understanding of how light can be engineered to influence the behavior of electrons in unprecedented ways.
Journal Reference:
- Bégin, JL., Karimi, E., Corkum, P. et al. Orbital angular momentum control of strong-field ionization in atoms and molecules. Nat Commun 16, 2467 (2025). DOI: 10.1038/s41467-025-57618-8
Source: Tech Explorist
