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Proceedings Paper

Diffractive efficiency of terahertz zone plates with continuous phase
Author(s): Dehua Li; Yang Zhao; Qingzhen Sun; Xiangdong Zhao; Wei Zhou; Liqiang Liu; Tao Jin
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Paper 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.

Paper Details

Date Published: 8 October 2010
PDF: 7 pages
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); doi: 10.1117/12.866663
Show Author Affiliations
Dehua Li, Shandong Univ. of Science & Technology (China)
Yang Zhao, Shandong Univ. of Science & Technology (China)
Qingzhen Sun, Shandong Univ. of Science & Technology (China)
Xiangdong Zhao, Shandong Univ. of Science & Technology (China)
Wei Zhou, Shandong Univ. of Science & Technology (China)
Liqiang Liu, Shandong Univ. of Science & Technology (China)
Tao Jin, Shandong Univ. of Science & Technology (China)


Published in SPIE Proceedings Vol. 7659:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing
Xiangang Luo; Georg von Freymann, Editor(s)

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