Researchers working at the Tomsk Polytechnic University have found a simple way to increase the sensitivity of terahertz radiation receivers by 11 dB or 3.5 times. To do this, it turned out to be enough to place on the surface of the receiver a “lens” in the form of a tiny Teflon cube with a side of 1 mm. The device of the receiver remains unchanged.
The wavelength of terahertz electromagnetic radiation, located in the spectrum between the microwave and infrared regions, does not exceed 1 mm. Such waves are capable of penetrating various materials. Moreover, unlike X-ray waves, they do not ionize the atoms of the substance.
The terahertz receiver is a key component of devices such as body scanners, spectrometers, and diagnostic devices. It is obvious that increasing the sensitivity of the receiver improves the performance of these devices. In contrast to the complex and expensive way of increasing the sensitivity by changing the design of the receiver and the materials used in it, the solution proposed by Siberian scientists attracts with its simple and cheapness.
A Teflon cube placed on the surface of the receiver focuses the radiation to the size of its sensitive area. It is noteworthy that this method of increasing the sensitivity is applicable to detectors operating in other wavelengths.
Along with scientists from Tomsk Polytechnic University, their colleagues from Spain, Poland and Great Britain took part in the work.
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