Scientists have taken an important step toward making powerful terahertz technology much smaller and more practical by fitting many of its key functions onto a single semiconductor chip.
The breakthrough, led by researchers at the University of California, Los Angeles (UCLA), could eventually help create faster wireless communication, better medical imaging, improved security scanners and more advanced remote sensing systems.
The research was published in Nature Communications.
Terahertz waves sit in a little-used part of the electromagnetic spectrum between microwaves and infrared light.
For years, researchers have known that these high-frequency waves could be extremely useful because they can carry large amounts of information and produce detailed images.
They could support future ultra-fast wireless networks, help detect hidden objects in security screening, improve environmental monitoring and even provide new ways to examine the human body without harmful radiation.
Despite this promise, terahertz systems have remained difficult to use outside research laboratories. Current systems are large, expensive and require many separate parts to work together.
These include lasers, amplifiers, signal generators, detectors and modulators, all of which must be carefully built, lined up and connected. This complexity makes the technology difficult to manufacture on a large scale and limits its use in everyday products.
The UCLA-led team has now shown that many of these separate components can be combined onto a single semiconductor chip using manufacturing methods that are already widely used in the photonics industry.
Photonics is a technology that uses light instead of electricity to process and transmit information, offering higher speeds and lower energy use than many traditional electronic systems.
The advance could do for terahertz technology what integrated circuits did for computers decades ago.
Early computers filled entire rooms, but combining electronic components onto a single chip eventually led to today’s compact microprocessors found in phones, laptops and countless other devices.
Researchers believe a similar approach could make terahertz systems much smaller, cheaper and easier to produce.
A key part of the new design is the use of quantum wells. These are extremely thin layers of semiconductor material that are carefully engineered to control how light behaves. Quantum wells are already commonly used in modern photonic chips, making them a practical choice for future manufacturing.
The researchers discovered that these quantum well structures could perform several important jobs at once. They can generate terahertz waves, detect them, strengthen their signals and control them on the same chip. This was achieved using a technique called gain-enhanced interband photomixing, in which two laser beams interact to create terahertz signals at a chosen frequency.
Tests showed that the new chip produced terahertz signals efficiently while also detecting them with high sensitivity, outperforming many existing photonics-based terahertz technologies.
Although more work is needed before the technology reaches commercial products, the study demonstrates a promising path toward compact and scalable terahertz systems.
By shrinking complex laboratory equipment onto a single chip built with established manufacturing techniques, the research could help bring terahertz technology into real-world applications, opening the door to faster communications, more capable imaging systems and smarter sensing technologies in the years ahead.
