In science, chirality, or “handedness”, is like the difference between left and right gloves. They look almost the same, but they don’t fit the same hand. Molecules work the same way, and in medicine, that difference can mean healing or harm.
To tell them apart, scientists usually rely on special light that spins clockwise or anticlockwise, like tiny drills. But until now, creating such spinning light has required exotic materials, engineered surfaces, or powerful lenses.
The new study shows you don’t need any of that; light can be coaxed to spin all on its own. Scientists at the University of East Anglia have shown that light can naturally develop this handed behavior all on its own.
The team found a hidden property of light that enables it to twist, spin, and behave differently. And for that, it doesn’t require mirrors, extra materials, or special lenses.
Researchers demonstrated that light can be “programmed” simply by exploiting its natural geometry.
The discovery challenges decades-old beliefs, revealing that light can exhibit chiral behavior while traveling freely through space.
According to researchers, this could ultimately lead to a world where light carries information, probes biology, manipulates matter, and protects quantum signals.
Light is believed to pass through straight lanes, but it can also create structured light (light whose brightness, shape, and direction are carefully arranged). For example, a twisting light can form a corkscrew shape known as an optical vortex. In this, each twist can store information, making this kind of light valuable for high-speed internet, secure communications, and advanced sensors.
Depending on the polarisation, light can also spin as it travels. This spin hides and reveals itself as the beam moves forward.
Dr. Isaac Nape, at the University of the Witwatersrand in Johannesburg, South Africa, believes that the topology is the reason behind these properties. “To explain it, imagine a mug and a doughnut,” he said.“You can morph one into the other without tearing it, because they both have one hole. That hole is a topological feature.”
Light carries a hidden fingerprint, a topological pattern buried in the way its polarization is arranged. This fingerprint doesn’t fade as the beam travels; instead, it quietly steers how the light evolves.
As the beam moves forward, that hidden structure compels spinning behavior to emerge, like choreography written into the geometry itself.
For scientists, this means a brand‑new control knob: by tuning light’s topology, they can decide when and where chirality, its left‑ or right‑handed spin, appears.
The discovery has wide-ranging implications. It could make medical tests simpler and more precise, especially in drug development. It could also let laser beams carry more information, boosting data speeds for communications and even future quantum networks.
And because the effect doesn’t depend on fragile materials or precision‑engineered surfaces, it promises to be cheaper and easier to use in real technologies.
By showing that light’s behavior can be steered by its own geometry, this research lays the groundwork for a new generation of light‑based tools.
Journal Reference:
Mkhumbuza, L., Ornelas, P., Dudley, A. et al. Topological control of chirality and spin with structured light. Light Sci Appl 15, 214 (2026). DOI: 10.1038/s41377-026-02278-6