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Method and device for calculating normalized orbital angular momentum flux density and storage medium

A technology of orbital angular momentum and flux density, which is applied in the field of optics, can solve problems such as calculation efficiency and result accuracy obstacles, a large number of modes, etc., so that calculation time and result accuracy are not affected, wide applicability, and calculation results are accurate and clear Effect

Active Publication Date: 2022-07-08
SUZHOU UNIV
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Problems solved by technology

However, this approximate calculation method requires a large number of modes, which brings great obstacles to the calculation efficiency and result accuracy.

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  • Method and device for calculating normalized orbital angular momentum flux density and storage medium

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Embodiment Construction

[0080] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0081] see figure 1 As shown, an embodiment of the present invention provides a method for calculating normalized orbital angular momentum flux density, including the following steps:

[0082] S1: According to the general expression of the orbital angular momentum flux of the partially coherent beam along the transmission direction and the cross spectral density matrix in the non-paraxial case, determine the orbital angular momentum flux expression of the focal field under the tight focusing system;

[0083] S2: Obtain the orbital angular momentum flux density expression according to the integral form of the orbital angular momentum flux expression;

[0084] S3: Decompose the orbital ...

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Abstract

The invention relates to a method for calculating normalized orbital angular momentum flux density. The method comprises the following steps: determining an orbital angular momentum flux expression of a lower focal field of a tight focusing system; obtaining an orbital angular momentum flux density expression according to the integral form of the orbital angular momentum flux expression; decomposing the orbital angular momentum flux density expression into decomposition formulas with similar forms; each decomposition formula is simplified into the sum of four convolution operations, and the orbital angular momentum flux density expression is written into the sum of the convolution operations; and normalizing the orbital angular momentum flux density to obtain an orbital angular momentum flux density expression of a fractional structure. According to the method, the normalized orbital angular momentum flux density is processed into a fractional structure, a numerator represents the sum of convolution operations, a denominator represents the sum of convolution operations, and rapid calculation can be achieved by means of software Matlab.

Description

technical field [0001] The present invention relates to the field of optical technology, in particular to a method, device and storage medium for calculating normalized orbital angular momentum flux density. Background technique [0002] In 1992, Allen first proposed the vortex beam, which is a special beam with a helical wavefront and carries orbital angular momentum (OAM), which is used in the fields of optical manipulation, remote sensing, imaging, quantum optics, optical communication, etc. Out of novel and interesting physical properties. Orbital angular momentum has also become the focus of research work by scholars at home and abroad, and its applications in optical tweezers and super-resolution microscopy are very rich. The orbital angular momentum (OAM) of vortex beams provides a new dimension for manipulating light-matter interactions and brings practical value to related fields. [0003] Most of the current research on orbital angular momentum has focused on the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06F17/16G06F17/15G02F1/00
CPCG06F17/18G06F17/15G06F17/16G02F1/00Y02E60/00
Inventor 严晨成陈亚红王飞蔡阳健
Owner SUZHOU UNIV
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