TERAHERTZ IMAGER BASED ON A THZ-TO-IR CONVERTER
A. G. Paulish1,2, B. N. Novgorodov1, S. V. Khryashchev1, S. A. Kuznetsov1,3
1Design and Technology Institute of Applied Microelectronics, prosp. Akademika Lavrent'eva 2/1, Novosibirsk, 630090
2Novosibirsk State Technical University, prosp. K. Marksa 20, Novosibirsk, 630073
3Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090
Keywords: терагерцовое излучение, детекторы терагерцового изображения, конверсия ТГц, ИК, обработка изображения, terahertz radiation, terahertz image detectors, THz-to-IR conversion, image processing
Abstract
A new terahertz (THz) imager based on THz-to-IR conversion has been proposed and studied.яThe THz-to-IR converter consists of an ultra-thin resonant THz absorber (meta-absorber) whose backside is coated with an emission layer with an emission coefficient close to unity. The absorption of THz radiation causes heating of the converter, which was recorded with an infrared camera from side of the the emission layer.яThe small thickness of the converter (more than 50 times shorter than the working wavelength of THz radiation) determines its low heat capacity, resulting in an increase in the sensitivity and speed of the visualizer.яOptimization of the optics of the THz visualizer, making cuts in the converter structure to Reduce the blooming and increase the response, and the IR image processing method, which increases the signal-to-noise ratio, provide an increased sensitivity of the THz imager at the level of sensitivity of thermal detectors in the 8-12 $\mu$m IR range
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