The new terahertz camera device provides greater sensitivity and speed than previous versions, and could be used for industrial inspection, airport security, and communications. Terahertz radiation, also known as submillimeter radiation, has wavelengths that lie between those of microwaves and vi
Illustration shows terahertz illumination entering the new camera system, where it stimulates quantum dots inside nanoscale holes to emit visible light, which is then detected using a CMOS-based chip like those in digital cameras. Credit: Courtesy of the researchers
Now, a new kind of camera that can detect terahertz pulses rapidly, with high sensitivity, and at room temperature and pressure has been developed by researchers at, the University of Minnesota, and Samsung. What’s more, it can simultaneously capture information about the orientation, or “polarization,” of the waves in real-time, which existing devices cannot.
The photons of terahertz radiation have extremely low energy, Nelson explains, which makes them hard to detect. “So, what this device is doing is converting that little tiny photon energy into something visible that’s easy to detect with a regular camera,” he says. In the team’s experiments, the device was able to detect terahertz pulses at low intensity levels that surpassed the capability of today’s large and expensive systems.
While the researchers say they have cracked the terahertz pulse detection problem with their new work, the lack of good sources remains — and is being worked on by many research groups around the world. The terahertz source used in the new study is a large and cumbersome array of lasers and optical devices that cannot easily be scaled to practical applications, Nelson says, but new sources based microelectronic techniques are well under development.
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