Improving the resolution of a solid immersion lens optical system using a multiphase Fresnel zone plate |
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Authors: | Yao-Ju Zhang Chong-Wei Zheng Hua-Ceng Xiao |
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Institution: | aDepartment of Physics & Electron-Information Science, Wenzhou Normal College, Wenzhou 325027, China;bDepartment of Biology & Environment Science, Wenzhou Normal College, Wenzhou 325027, China |
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Abstract: | We propose a method to improve the resolution of near-field optical system with a solid immersion lens by using a multiphase level Fresnel zone plate. The analyses are based on scalar angular spectrum theory. The results show that the multiphase Fresnel zone plate can not only decrease the spot size but also decrease the sidelobe intensity and enhance greatly the diffractive efficiency compared with annular amplitude filter or binary 2-, 3-, 4-zone phase filter. |
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Keywords: | Multiphase level Fresnel zone plate Solid immersion lens Resolution Scalar angular spectrum |
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