Design method of high-numerical-aperture short-focal-length step phase position type thick FZP

A technology with high numerical aperture and design method, applied in the direction of optical components, optics, instruments, etc., can solve the problem that the single-screen diffraction theory cannot consider FZP, etc., and achieve the effect of effective design

Inactive Publication Date: 2014-10-08
WENZHOU UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that the conventional single-screen diffraction theory cannot consider the diffraction effect in the FZP body in the design and analysis of the step phase thic

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  • Design method of high-numerical-aperture short-focal-length step phase position type thick FZP
  • Design method of high-numerical-aperture short-focal-length step phase position type thick FZP
  • Design method of high-numerical-aperture short-focal-length step phase position type thick FZP

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Embodiment Construction

[0030] See attached figure 1 to attach image 3 , in order to achieve the above object, the present invention is based on the vector Rayleigh-Sommerfeld (VRS, Vector Rayleigh-Sommerfeld) diffraction theory, considering the diffraction effect in the FZP body, proposes a design high-resolution short focal length step phase thick FZP method. For the convenience of description, the Fresnel zone plate is abbreviated as: FZP; the multi-step phase Fresnel zone plate is abbreviated as: MSPFZP.

[0031] A design method of high numerical aperture and short focal length stepped phase type thick FZP, based on multi-screen diffraction theory, and carried out according to the following steps:

[0032] Step 1: Design the structure of multi-step phase type FZP (MSPFZP);

[0033] Quantify the plane-parallel optical film 1 with refractive index n and thickness d into FZP of M steps, the step phase adopts the method of equal height quantization, and the height of each step is d / M; as figure ...

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Abstract

The invention relates to a design method of a high-numerical-aperture short-focal-length step phase position type thick FZP. The step phase position type FZP is equivalent to multiple diffraction screens based on a multi-screen diffraction theory, the diffraction effect in a step phase position type FZP body is considered, a diffraction field of the whole FZP is formed by superposing diffraction fields of multiple equivalent diffraction fields, a vector diffraction theoretical formula is formed, the step phase position type FZP can be designed and diffraction field distribution can be analyzed according to a vector diffraction theory. By adopting the design method, a computing result can be basically consistent to a time domain finite difference simulated result, and the high-numerical-aperture short-focal-length step phase position type thick FZP can be simply and effectively designed.

Description

technical field [0001] The invention relates to the field of optical microscopy and imaging technology, especially in the design of binary optical diffraction focusing elements with high numerical aperture and short focal length, and proposes to design a high-resolution short-focus multi-step phase thick Fresnel based on vector diffraction theory. The zone plate method. Background technique [0002] Focusing elements are commonly used optical elements in optical instruments and equipment. A lens is a commonly used focusing element by refraction, but it cannot be used in the X-ray band because general materials do not refract X-rays. Fresnel Zone Plate (FZP, Fresnel Zone Plate) is an important diffractive optical element, which has a wide range of applications, and can be focused by FZP from visible light to X-ray bands. On the other hand, in order to obtain high resolution, it is necessary to make a high numerical aperture lens, which is currently more difficult, because w...

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Application Information

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IPC IPC(8): G02B27/42
Inventor 张耀举张栋庄友谊阮秀凯朱海永安鸿昌朱艳
Owner WENZHOU UNIVERSITY
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