Diffractive efficiency of terahertz zone plates with continuous phase

Dehua Li; Yang Zhao; Qingzhen Sun; Xiangdong Zhao; Wei Zhou; Liqiang Liu; Tao Jin

doi:10.1117/12.866663

8 October 2010 Diffractive efficiency of terahertz zone plates with continuous phase

Dehua Li, Yang Zhao, Qingzhen Sun, Xiangdong Zhao, Wei Zhou, Liqiang Liu, Tao Jin

Proceedings Volume 7659, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing; 765907 (2010) https://doi.org/10.1117/12.866663
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

We presented a design of the zone plate with continuous phase with Polytetrafluoroethylene (PTFE) based on scalar diffraction theory. Diffraction fields of the zone plate with continuous phase and the phase-correcting Fresnel zone plate with incidence of uniform plane wave were analyzed and compared. The effects of the focal length and diameter of the zone plate with continuous phase on the diffraction field were discussed. The simulations of intensity distribution on the focal plane and the optic axis based on Rayleigh-Sommerfeld diffraction formula were completed using Matlab. The results indicate that the zone plate with continuous phase performs better than the phase-correcting Fresnel zone plate. The intensity on the focus of the zone plate with continuous phase is 1.17, 1.35, 2.62 times stronger than that on 8-level, 4-level, 2-level phase-correcting Fresnel zone plate's respectively. The fabrication process might give rise to a phase error, such as groove depth error, surface roughness. The effects of the phase errors on the performance of the zone plate were discussed.

Citation Download Citation

Dehua Li, Yang Zhao, Qingzhen Sun, Xiangdong Zhao, Wei Zhou, Liqiang Liu, and Tao Jin "Diffractive efficiency of terahertz zone plates with continuous phase", Proc. SPIE 7659, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, 765907 (8 October 2010); https://doi.org/10.1117/12.866663

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KEYWORDS

Zone plates

Diffraction

Surface roughness

Wave plates

Refractive index

Terahertz radiation

Absorption

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