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Tokyo Institute Of Technology Research: Wearable Terahertz Scanning Device For Inspection Of Medical Equipment And The Human Body

November 14, 2016 By PR Web

Imaging devices based on terahertz waves show promise for noninvasive inspection of solid objects and soft tissue of the human body. However, terahertz waves have difficulty in imaging and reproducing the curved contours of three-dimensional objects. Furthermore, terahertz devices currently used for whole body scans at airports must rotate 360 degrees around the human body, and thus they are large, bulky, and not portable. In addition, the materials used to fabricate conventional terahertz systems are not flexible, and the terahertz detectors must be cooled in order to achieve high detection sensitivity.

Therefore, researchers are constantly searching for ways of producing terahertz imaging systems that are portable, flexible, and operate efficiently at room temperature. To address these challenges, Yukio Kawano and colleagues at the Laboratory for Future Interdisciplinary Research of Science and Technology, Tokyo Institute of Technology, have demonstrated a terahertz imaging device fabricated with arrays of carbon nanotubes (CNT). Notably, CNTs have previously been used for the fabrication of photodetectors that operate in the visible, infrared, and terahertz regions of the electromagnetic spectrum.

Terahertz imaging of a human hand using arrays of carbon nanotubes: (left) human hand inserted into the imaging device, and (right) resulting scan of the human hand. (Credit: PR Web)

The Tokyo Tech team fabricated a flexible, wide-band terahertz scanner by integrating 23 CNT detector elements into a single array. The mechanical strength of the CNT film used in the detector enabled it to be readily bent over a wide range of angles, unlike conventional semiconductor materials that are fragile and break under stress. Importantly, the CNT films also absorb electromagnetic radiation over a broad terahertz range, which eliminates the need for planar antennas to scan objects. The terahertz scanner developed by Kawano and his team was successfully used for active imaging of flat and curved samples; multiview scanning of cylindrical samples; and passive wearable imaging of a human hand.

In the future, the research team expects that the applications of their terahertz scanner will enhance the capability of noninvasive inspections in pharmaceutics, food quality control, and medical monitoring. These applications are possible because the terahertz scanner is wearable, portable, and can scan 3D objects without requiring complex optics or equipment.

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