Scientists Uncover “Astonishing” Hidden Property of Light

A newly uncovered property of light suggests it may be far more self-sufficient than previously believed.

Researchers at the University of East Anglia have identified a previously unknown property of light that allows it to twist, spin, and behave in unusual ways – without the need for mirrors, materials, or specialized lenses.

In a finding that could reshape medical diagnostics, data transmission, and future quantum systems, scientists from the UK and South Africa demonstrated that light can be “programmed” by taking advantage of its inherent geometry.

This result challenges long-standing assumptions, showing that light can develop chiral behavior – meaning it can act like a left or right hand – while moving freely through space.

According to the team, this could eventually enable light to carry information, examine biological systems, manipulate matter, and safeguard quantum signals.

Why Chirality Matters

Chirality, or “handedness,” plays a key role in science. Many molecules, including those used in medicines, exist in left- and right-handed forms that appear nearly identical but can behave very differently in the body.

To distinguish between them, scientists typically rely on specialized light that rotates either clockwise or anticlockwise. Until now, generating and controlling this type of light required carefully designed surfaces, advanced materials, or intense focusing with powerful lenses.

The new research shows those steps may not be necessary.

“Our work shows that light can naturally develop this handed behavior all on its own,” said Dr. Kayn Forbes from UEA’s School of Chemistry, Pharmacy and Pharmacology.

“You just have to prepare it in the right way. Most people think of light as traveling in straight lines. But scientists can also create structured light – light whose brightness, shape, and direction are carefully arranged.”

Twisting, Spinning, and Emerging Effects

He continues, “One extreme example is light that twists as it travels, forming a corkscrew shape known as an optical vortex. Each twist can carry information, making this kind of light valuable for high-speed internet, secure communications, and advanced sensors.”

“Light can also spin as it travels, depending on how it is polarized. This spin can be left-handed or right-handed – another form of chirality.”

Previously, the interaction between light’s spin and its twisting motion was thought to be extremely weak and only observable under carefully controlled conditions. The UEA team found that when light is prepared in a precisely balanced state, its spin can emerge naturally as it travels through empty space.

“It starts off with no spin at all,” explained MSc student Light Mkhumbuza, who carried out key experiments. “But as the beam travels forward, spinning regions appear and separate out – almost as if the spin was hiding and then revealed itself.”

No mirrors. No special materials. Just light moving freely.

The Role of Topology

According to Dr. Isaac Nape at the University of the Witwatersrand in Johannesburg, South Africa, the explanation lies in topology – a branch of mathematics that studies properties that remain unchanged even when objects are stretched or reshaped.

“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 appears to have its own version of this “hole count” – a hidden topological signature embedded in the arrangement of its polarization. This feature persists as light travels and subtly directs how the beam evolves.

As the beam moves forward, this internal structure causes spinning behavior to emerge, giving researchers a new way to control light using geometry alone.

“This gives us a completely new tuning knob for light. By adjusting its topology, we can decide how and where chirality appears,” said Dr. Nape.

Future Technologies and Impact

“The implications are wide-ranging,” said Dr. Forbes. “This work could lead to simpler and more sensitive medical tests, especially in drug development.”

He continues, “It could also be used to pack more information into laser beams – boosting data capacity for communications, including future quantum networks. And because the effect doesn’t rely on fragile materials or precision-engineered surfaces, it could be easier and cheaper to use in real-world technologies.”

“This research could lay the foundations for a new generation of light-based technologies, by showing that light’s behavior can be controlled using its own internal geometry,” he added.

Key future applications:

• Simpler medical and pharmaceutical tests, using specially structured light to distinguish left- and right-handed molecules vital for drug safety and disease detection.
• Compact optical sensors capable of identifying biological and chemical substances quickly, cheaply, and without laboratory-grade equipment.
• More powerful communication technologies, where information is packed into multiple twisting and spinning states of light to boost data capacity and security.
• Advanced tools for biology and nanotechnology, allowing tiny particles, cells, or molecules to be moved and rotated using light alone.
• More robust quantum technologies, with topology helping protect delicate quantum information from noise and disruption.

The researchers say their findings challenge long-held ideas about what light can do on its own.

“For something so familiar, light is proving to be far richer, stranger, and more powerful than anyone imagined,” said Dr. Forbes.

“And astonishingly, this new behavior has been there all along — just waiting to be seen.”

Reference: “Topological control of chirality and spin with structured light” by Light Mkhumbuza, Pedro Ornelas, Angela Dudley, Isaac Nape and Kayn A. Forbes, 24 April 2026, Light: Science & Applications.
DOI: 10.1038/s41377-026-02278-6

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