Method for acquiring diffraction pattern generated based on arbitrarily-shaped aperture

Abstract

The invention relates to a technology for generating a diffraction pattern through light irradiation via an arbitrarily-shaped aperture. The invention discloses a method for acquiring a diffraction pattern generated based on an arbitrarily-shaped aperture, comprising the following steps: first, making an aperture pattern of a desired arbitrary shape; then, pasting the aperture pattern on the blank interface of a Windows drawing tool, and filling the surrounding space of the aperture with black; next, calling MATLAB software to obtain a corresponding gray level matrix; and finally, calling the MATLAB software to carry out Fourier transform of the matrix, obtaining the frequency domain distribution corresponding to the aperture pattern through a fftshift function, and working out the square of the model to obtain a Fraunhofer diffraction pattern generated based on the aperture. The problem that it is difficult to generate a Fraunhofer diffraction pattern based on apertures other than rectangular and circular apertures for the scalar diffraction theory is solved. The method has the advantages of simple operation, quickness, accuracy and the like. People's understanding of the light diffraction phenomenon is enhanced, and the theory of light diffraction is enriched greatly.

Description

technical field [0001] The invention relates to a method for obtaining a diffraction pattern produced by an aperture of an arbitrary shape, which is used for studying and analyzing the diffraction pattern generated by an aperture of an arbitrary shape after being irradiated with light. Background technique [0002] Diffraction of light is one of the most fundamental physical phenomena in optics, and it is also one of the most difficult problems in optics. Due to the difficulty in mathematics, in most practical problems, only approximate methods can be used to solve them. At present, the relatively mature Kirchhoff diffraction theory and Rayleigh-Sommerfeld diffraction theory have carried out some simplification and approximate processing on the light field. The most important thing in these processing is to regard the light wave as a scalar wave. Therefore, these Theories all belong to the category of scalar diffraction theory. [0003] The scalar diffraction theory uses a...

AI Technical Summary

Problems solved by technology

So far, the scalar diffraction theory has studied the Fraunhofer diffraction patterns produced by several typical apertures (including rectangular apertures and circular apertures), and given specific analytical formulas, but for apertures of other shapes, such as triangles, For polygons such as pentagons, heptagons and even apertures of arbitrary shapes, it is difficult to give analytical solutions to their amplitude transmittance functions and their Fourier transformed functions, so scalar diffraction theory is difficult to obtain other than rectangular and circular apertures. Fraunhofer Diffraction Patterns Produced by Other Aperture Shapes

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