Due to the limitation of Abbe diffraction limit, the traditional terahertz (THz) continuous wave imaging methods based on lenses or mirrors are difficult to achieve super-resolution. Here we present a confocal waveguide scanning method for THz reflective super-resolution imaging. In the method, a low loss THz hollow waveguide is used to replace the traditional terahertz lens or parabolic mirror. Through optimizing the size of the waveguide, we can achieve far field subwavelength focusing at 0.1THz and achieve super-resolution terahertz imaging. In addition, a slider-crank high-speed scanning mechanism is used in the scanning system, and the imaging speed is more than 10 times faster than the traditional step scanning system based on linear guides. In addition, its application in the field of nondestructive testing is introduced.
Here we describe a novel reflective confocal scanning method for super-resolution terahertz (THz) imaging. The traditional continuous-wave THz confocal method is difficult to break through the diffraction limit owing to the Abbe limit. So, it’s difficult to achieve super-resolution images, especially in low frequency THz wavebands. Besides, the traditional terahertz lens system has a large loss, so it cannot achieve long-distance transmission and imaging. In this paper, low-cost and low-loss terahertz waveguides are printed to replace conventional lenses. Through the reasonable design of the waveguide, we can breaks through the diffraction limit and achieve sub-wavelength focusing, so as to achieve super-resolution terahertz imaging. The final experimental resolution is less than half of the wavelength.
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