Light is one of the most extensively studied phenomena in physics, yet scientists continue to uncover surprising details about its behaviour.

An international research team has discovered that carefully structured light can develop distinct spinning patterns as it travels through empty space, without requiring additional lenses or specialised materials.

The findings, published in Light: Science & Applications in October 2026, reveal how the internal geometry of a light beam can influence its properties. Researchers believe this discovery could eventually contribute to more sensitive medical tests, advanced optical communications and emerging quantum technologies.

Why Light Can Behave Differently

Light is commonly described as travelling in straight lines, but its behaviour becomes considerably more complex when scientists manipulate the structure of a beam.

One example is an optical vortex, in which the light's wavefront twists around its direction of travel, forming a spiral pattern.

Light also possesses a property called polarisation, which describes the orientation and movement of its electric field.

Certain polarisation patterns produce rotational behaviour known as spin. Depending on its direction, this rotation can be described as left-handed or right-handed. The distinction is related to chirality, a property found throughout nature, including in many biological molecules.

A Surprising Discovery In The Laboratory

Researchers from the University of East Anglia in the United Kingdom collaborated with scientists in South Africa to investigate how structured light behaves during propagation.

They prepared a beam with a carefully balanced internal arrangement. Initially, the light showed no net spin. As it travelled forward, however, separate regions displaying opposite spinning behaviours began to emerge. This was particularly interesting because the effect occurred without additional optical components altering the beam during its journey.

Researcher Light Mkhumbuza, who conducted key experiments, explained that the spinning regions appeared progressively as the beam travelled, revealing behaviour that had initially been concealed within its structure.

The Mathematics Behind The Effect

To understand the phenomenon, scientists examined the topology of light. Topology is a branch of mathematics concerned with structural properties that remain unchanged during continuous transformations. Dr Isaac Nape, from the University of the Witwatersrand, explained that these mathematical characteristics can act as a distinctive signature within structured light.

Even when a beam changes shape during propagation, its underlying topological arrangement can influence where different spinning regions appear.

By adjusting this initial structure, researchers demonstrated a new way to control the emergence of left-handed and right-handed patterns.

Possible Benefits For Medical Research

One promising application involves identifying molecules that exist in different mirror-image forms. These molecular arrangements can have different biological effects despite sharing the same chemical composition. Distinguishing between them is particularly important in pharmaceutical research, where molecular structure can influence how medicines interact with the body.

Dr Kayn Forbes, who led the research, suggested that controlling light through its internal geometry could eventually support simpler and more sensitive diagnostic technologies. However, these applications remain theoretical possibilities rather than established clinical tools.

Could Communications Become Faster?

The discovery may also have implications for transmitting information. Scientists already investigate ways of encoding data into the twisting and polarisation patterns of light. Greater control over these properties could potentially increase the information carried by optical beams and support future quantum communication systems.

Another possibility involves developing optical sensors that require fewer specialised components. Nevertheless, practical applications will require further experimentation to establish reliability, efficiency and compatibility with existing technologies.

What Comes Next?

The research demonstrates that some unusual optical effects can emerge from a beam's own structure rather than from external devices. Future investigations may explore how these principles behave under different experimental conditions and whether they can be incorporated into practical equipment.

Forbes believes the discovery provides a valuable new approach to manipulating light, particularly because it reduces dependence on specially engineered optical materials.

Although commercial applications remain some distance away, the findings reveal an unexpected connection between geometry and the physical behaviour of light. Even a phenomenon as familiar as light still holds important scientific mysteries.