9 November 2018 Terajet effect of dielectric sphere and THz imaging
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Abstract
Analogous to microsphere optical nanoscope, an easy and low-price method of THz imaging is proposed and developed for improving the spatial resolution beyond the diffraction limit. By attaching a 2-4 mm diameter Teflon sphere, a narrow, high-intensity, subdiffraction-waist THz beam with a strong jet-like distribution propagates into the background medium from the sphere’s shadow-side surface and a subwavelength spatial resolution better than λ/3 is demonstrated. Furthermore, the dielectric sphere-coupled THz microscope not only enables far-field, large-area measurement but also characterizes high-throughput and broad-band imaging properties. In addition, the size effect on terajet of dielectric sphere was simulated and shows that its magnification capability and focal length are size-dependent and frequencysensitive.
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Qingshan Qu, Qingshan Qu, Hailing Liu, Hailing Liu, Di Zhu, Di Zhu, Menghan Yang, Menghan Yang, Bin Cui, Bin Cui, Shuai Feng, Shuai Feng, Yuping Yang, Yuping Yang, "Terajet effect of dielectric sphere and THz imaging", Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 1082606 (9 November 2018); doi: 10.1117/12.2500909; https://doi.org/10.1117/12.2500909
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