Axial intensity distribution behind a Fresnel zone plate |
| |
Authors: | Yaoju Zhang Chongwei Zheng |
| |
Institution: | Department of Physics and Electron-Information Science, Wenzhou Normal College, Wenzhou 325027, China |
| |
Abstract: | An analytical expression based on an improved Rayleigh–Sommerfeld diffraction formula with evanescent term is derived for analyzing the axial light intensity distribution throughout the whole space behind a Fresnel zone plate. The effects of the number of Fresnel zones and the size of aperture on the axial intensity distribution are calculated for two kinds of Fresnel zone plate with larger and smaller aperture. The validity of the general formulae for calculating the focal lengths and the relative intensities of the foci of a Fresnel zone plate is analyzed. |
| |
Keywords: | Fresnel zone plate Improved Rayleigh– Sommerfeld formula Axial intensity distribution |
本文献已被 ScienceDirect 等数据库收录! |