Imagine a future where your drone navigates through smoke-filled fire scenes or a Mars rover traverses sandstorms, yet they still exchange information at high speeds-not via radio waves or ordinary lasers, but through invisible "ultrafast ultraviolet light."
Recently, scientists from the University of Nottingham and Imperial College London jointly developed a revolutionary communication technology: utilizing ultraviolet light with an extremely short wavelength (UV-C) to transmit information at trillions of times per second. The process is unimaginably fast-within a single blink, it can complete hundreds of trillions of data transfers. This groundbreaking achievement was published on January 5, 2026, in the top-tier international journal Light: Science & Applications, opening new doors for high-speed communication in extreme environments.
At the core of this innovation lies a bidirectional ultraviolet laser system capable of both transmission and reception. Traditional communications often rely on infrared or visible light, but these face a critical limitation: signals break down upon encountering obstacles like smoke, dust, foliage, or even building corners. In contrast, the scientists utilized UV-C light with wavelengths between 100 and 280 nanometers. This light possesses a remarkable property: it scatters intensely in air, much like a flashlight beam bouncing in all directions when shone into fog. While this might sound like a drawback, it's precisely this "flaw" that enables "non-line-of-sight communication." In other words, even without a direct path between transmitter and receiver, information can still be delivered as long as the light bounces around in the air a few times.
But here's the catch: While UV-C light is useful, it's extremely difficult to manipulate. For decades, scientists lacked equipment capable of efficiently generating and precisely detecting this light. Either the light sources were bulky and expensive, or the detectors were too insensitive to be practical. This time, the research team finally found a solution: using an optical technique called "cascaded second harmonic generation," they progressively "compressed" ordinary laser light into ultra-short UV-C pulses within a special crystal-each pulse lasting less than one femtosecond (one quadrillionth of a second, or one-thousandth of a trillionth of a second). This is akin to cramming the information of an entire high-definition movie into a flash countless times faster than lightning.
The receiver is even more crucial. Instead of traditional silicon-based sensors, the researchers employed a two-dimensional material called gallium selenide (GaSe)-just a few atomic layers thick, like an ultra-thin sheet of paper. This material exhibits extreme sensitivity to UV-C light, responding rapidly even at room temperature. It also demonstrates a rare "superlinear" property: the stronger the light, the faster the current increases, enabling clear detection of faint signals. The entire detector was "grown" on a 2-inch sapphire wafer using molecular beam epitaxy (MBE) technology, paving the way for future mass production at manageable costs.
To validate its effectiveness, the team conducted a free-space communication experiment: one side encoded information (such as text or commands) using a UV-C laser, while the other side received and decoded it with the two-dimensional material sensor. The results were encouraging-information was transmitted accurately and at remarkable speeds. This demonstrates that the system not only works but can be deployed in real-world scenarios.
So what exactly can this technology do? First, it's particularly suited for complex, hazardous, or line-of-sight-obstructed environments. Examples include firefighters coordinating operations in thick smoke, robots searching for survivors in rubble, or autonomous vehicle fleets maintaining communication during sandstorms. Second, since UV-C light doesn't interfere with existing radio frequency bands and isn't easily intercepted, it holds immense potential for secure military communications. Additionally, these ultrafast lasers can be used for ultra-high-resolution microscopic imaging, precision material processing, and even exploring new phenomena in quantum optics.
Lead researcher Professor Amalia Patanè stated: "This marks the first time humans have integrated the generation and detection of femtosecond UV-C lasers onto a single manufacturing-compatible platform. We've not only built the 'gun,' but also the 'eyes.'" Co-author Professor John Tish emphasized that their system's high efficiency and relatively simple structure make it promising for portable devices, potentially affordable for more laboratories and businesses.
Of course, this technology is still far from being installed in a mobile phone. But its significance lies in proving that the path of "ultrafast ultraviolet communication" is viable. With the advancement of two-dimensional materials and photonic chips, we may one day see UV-C communication modules the size of a fingernail embedded in drones, satellites, or even wearable devices-transmitting critical information at the speed of light in ways invisible to the naked eye.
