Scientists have unlocked a new way to control ionization, the process where atoms lose electrons, using specially designed light beams
By leveraging optical vortex beams, light that carries angular momentum, they can precisely dictate how electrons break free from atoms. This discovery could reshape imaging technology, enhance particle acceleration, and open doors to advancements in quantum computing.
Unlocking the Secrets of Ionization
Atoms are the fundamental building blocks of everything around us. Occasionally, they lose electrons and become charged particles, a process known as ionization. This phenomenon occurs in lightning, plasma TVs, and even the northern lights. Until now, scientists believed their ability to control ionization was quite limited.
A research team led by Ravi Bhardwaj, Full Professor at the University of Ottawa’s Department of Physics, and PhD student Jean-Luc Begin, in collaboration with Professors Ebrahim Karimi, Paul Corkum, and Thomas Brabec, has introduced a groundbreaking method to manipulate ionization using specially structured light beams.
Optical Vortex Beams – A New Approach
Ionization plays a key role in strong field physics and attosecond science, governing how electrons break free from their atomic bonds. Traditionally, scientists thought this process had strict limitations on how much it could be controlled. However, this new study challenges that belief.
“We have demonstrated that by using optical vortex beams—light beams that carry angular momentum—we can precisely control how an electron is ejected from an atom,” explains Professor Bhardwaj. “This discovery opens up new possibilities for enhancing technology in areas such as imaging and particle acceleration.”
Experimenting with Light and Electrons
The research took place over two years at uOttawa’s Advanced Research Complex. The team found that the handedness and properties of the optical vortex beams significantly affect ionization rates. By adjusting the position of a “null intensity region” within the beam, they achieved selective ionization, introducing a novel concept called optical dichroism.
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