Scientists Create Miniature 'Optical Tornadoes' Using Liquid Crystal Technology
Breakthrough allows light to spiral like whirlwinds in its lowest-energy state, potentially transforming quantum communication and photonic devices.
Scientists have successfully created tiny "optical tornadoes"—swirling beams of light that twist like miniature whirlwinds—using a surprisingly simple setup based on liquid crystals. The breakthrough, achieved by researchers from the University of Warsaw, Military University of Technology, and Institut Pascal CNRS, demonstrates a new way of building miniature light sources with complex shapes that could support simpler and more scalable photonic devices for optical communication and quantum technologies.
"Our solution combines several fields of physics, from quantum mechanics, through materials engineering, to optics and solid-state physics," explains Professor Jacek Szczytko from the Faculty of Physics at the University of Warsaw. The inspiration came from systems known from atomic physics, where electrons can occupy different energy states. In photonics, a similar role is played by optical traps, which confine light instead of electrons. The resulting optical vortex causes light waves to twist around their axis, with both the phase and polarization rotating in spiral patterns.
Rather than relying on complex nanotechnology, the team used self-organizing structures called torons within liquid crystal materials. "Instead of building complex systems, we used a liquid crystal, a material with properties intermediate between a liquid and a solid," explains Joanna Mędrzycka, a nanotechnology student who helped prepare the liquid crystal samples. Although the material can flow like a liquid, its molecules arrange themselves in an ordered way, maintaining fixed orientations and relative positions similar to crystals.
Within this material, special defects known as torons form tightly twisted spirals similar to DNA structure, along which liquid crystal molecules arrange themselves. When these spirals close by joining their ends into a ring resembling a doughnut, they create torons that act as microscopic traps for light. A crucial advancement was creating what researchers describe as a synthetic magnetic field for photons. While light does not respond to magnetic fields like electrons do, similar behavior can be achieved through spatially variable birefringence—the difference in how different light polarizations propagate.
The achievement represents a significant step toward practical applications in quantum communication and photonic computing. These structured light states are particularly attractive for controlling microscopic objects and encoding information in quantum systems. The simplicity of the liquid crystal approach could make such technologies more accessible and scalable compared to previous methods that required elaborate nanostructures or large experimental systems. Future research will focus on expanding the range of achievable optical structures and exploring their integration into practical devices.
