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T-rays: One Step Closer to the Medical Tricorder

January 25th, 2012 Stanley Darma Radiology

Researchers from the Institute of Materials Research and Engineering, a collaboration between A-STAR in Singapore and Imperial College in London, have come up with a new way to create electromagnetic Terahertz waves (T-rays). The new technology can make T-rays into a stronger, more directional beam than current methods. This could allow T-ray devices to become much smaller and cheaper in the future. The results of their study were published in Nature Photonics.

Current T-ray imaging devices, like airport full-body scanners, are very large and expensive, and consume large amounts of energy as well. A portable T-ray scanning device could in the future make a medical tricorder possible, as T-rays can detect certain biological processes, such as changes in blood flow. As every molecule has a unique signature in the THz range, T-rays can sense for specific molecules as well.

The innovation of this new technology lies in a new nano-antenna integrated into a semiconductor chip that can create much stronger THz fields and lead to higher resolution imaging.

Some details from the announcement:

“…the researchers demonstrated that it is possible to produce a strong beam of T-rays by shining light of differing wavelengths on a pair of electrodes – two pointed strips of metal separated by a 100 nanometre gap on top of a semiconductor wafer. The structure of the tip-to-tip nano-sized gap electrode greatly enhances the THz field and acts like a nano-antenna to amplify the wave generated. In this method, THz waves are produced by an interaction between the electromagnetic waves of the light pulses and a powerful current passing between the semiconductor electrodes. The scientists are able to tune the wavelength of the T-rays to create a beam that is useable in the scanning technology….”

Press release: T-rays technology could help develop Star Trek-style hand-held medical scanners

Article in Nature Photonics: Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer

Stanley Darma

Stanley is an MD and PhD candidate at the Academic Medical Center Amsterdam, the Netherlands. His research field is in ophthalmology and optical coherence tomography, making amazing pictures of and performing precise measurements in the human retina everyday.

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