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THz imaging technology

Like other imaging techniques in different spectral bands, THz imaging technology also utilizes THz rays to irradiate the object being measured, obtaining information about the sample through transmission or reflection, and then forming an image. THz imaging technology can be divided into two methods: pulsed and continuous. The former possesses the characteristics of THz time-domain spectroscopy. At the same time, it can perform functional imaging of material groups, obtaining the distribution of refractive indices within the material. For example, with a sunflower seed, it is possible to easily obtain internal information about the seed. Figures 3-4 show the physical photograph of a sunflower seed sample and the corresponding THz transmission image reconstructed using the method, which can clearly distinguish the contour of the shell and the shape of the kernel hidden inside the shell, which is highly desirable. Similarly, if the sample is a human tooth, the normal parts of the tooth and the damaged or decayed parts can be easily distinguished, and there is no additional harm to the human body as X-rays are not required.

THz radar

In essence, this is also a form of imaging. Given the strong absorption of THz rays by moisture in the atmosphere, short-range radar represents a strength of THz technology. One highly anticipated application is through-wall radar and mine detection radar, which can also be used in search and rescue operations for victims in earthquake relief efforts, although these are still in the research and development stage. This is because materials such as walls and wood allow THz rays to pass through, whereas the human body, which contains a significant amount of water, does not. Therefore, it is possible to detect the distribution and activities of individuals inside a building through the walls, which can have a profound impact on counter-terrorism and anti-kidnapping efforts. Similarly, this technology can also be used to locate individuals beneath rubble. As for mine detection radar, it is based on the fact that mines are typically located on or near the surface of the ground, and dry soil allows THz rays to pass through. The mines will reflect the THz rays back, enabling the detection of the targets.

THz Astronomy

In the universe, a significant amount of matter emits THz electromagnetic waves. Numerous molecules such as carbon (C), water (H2O), carbon monoxide (CO), nitrogen (N2), and oxygen (O2) can be detected in the THz frequency band. Prior to the application of THz technology, some of these substances were completely undetectable, while others could only be detected at very high altitudes or on the surface of the moon.