Design and light field analysis of biconical axicon for generating terahertz Bessel beam

Jingjing Yu; Jiaojiao Ren; Dandan Zhang; Zongyu Cui

doi:10.1117/12.2661517

12 April 2023 Design and light field analysis of biconical axicon for generating terahertz Bessel beam

Jingjing Yu, Jiaojiao Ren, Dandan Zhang, Zongyu Cui

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 1256503 (2023) https://doi.org/10.1117/12.2661517
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

A biconical axicon structure that can generate terahertz Bessel beams with long non-diffraction distance is designed. The optical element is centered on the axis of the traditional axicon and grinds the bottom surface of the axicon into a conical surface. The non-diffraction distance and light field distribution expression of terahertz Bessel beam generated by biconical axicon are theoretically analyzed. The light field distribution characteristics of traditional axicon and biconical axicon are numerically simulated. The results show that the terahertz wave can generate a terahertz Bessel beam with a non-diffraction distance of 110.18 mm through a biconical axicon with a bottom angle of 20 ° and 15 °. Under the same parameters, the traditional axicon can only generate a terahertz Bessel beam of 27.55 mm, and the non-diffraction distance is broadened by 82.63 mm.

Citation Download Citation

Jingjing Yu, Jiaojiao Ren, Dandan Zhang, and Zongyu Cui "Design and light field analysis of biconical axicon for generating terahertz Bessel beam", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 1256503 (12 April 2023); https://doi.org/10.1117/12.2661517

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