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Vortex beam spiral spectrum analysis method based on loop integration

A loop integration and spectrum analysis technology, applied in the field of vortex beam helical spectrum analysis, can solve the problems of high processing difficulty, large number of discrete points, and large computational complexity, and achieves the effect of reducing the amount of complex computations

Active Publication Date: 2021-07-16
XIAMEN UNIV
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Problems solved by technology

The spiral spectrum analysis method is based on the area integral of harmonic energy on the receiving plane. Due to the large number of discrete points of each OAM mode harmonic on the plane, it is difficult to process and computationally complex in practical applications.

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  • Vortex beam spiral spectrum analysis method based on loop integration
  • Vortex beam spiral spectrum analysis method based on loop integration
  • Vortex beam spiral spectrum analysis method based on loop integration

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Embodiment Construction

[0038] In order to facilitate the understanding of the present invention, the present invention will be more fully described below in conjunction with the relevant drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the described embodiments of the invention. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0039] The technical principle of the present invention is: based on the traditional vortex beam helical spectrum analysis theory, the complex amplitude of the vortex beam is linearly expanded to obtain the amplitudes of harmonics of different orders, and the amplitudes of the harmonics are conjugated and multiplied and integrated by the area to obtain the amplitudes of each order. Harmonic helix spectrum component; according to the integral median t...

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Abstract

The invention discloses a vortex beam spiral spectrum analysis method based on loop integration, and belongs to the field of electromagnetic vortexes. The method comprises the following steps: 1) determining a loop integral radius for loop integral spiral spectrum analysis; 2) according to the expression characteristics of the loop integral radius, determining key parameters for obtaining a loop integral radius value, wherein the key parameters comprise a ring surface distance, a girdling radius and a coherence length; 3) after determining a loop integral radius value, obtaining phase distribution, OAM order, amplitude distribution and power distribution on the closed circular ring according to vortex wave field distribution; and 4) determining spiral spectrum distribution of harmonic waves of all orders on the closed circular ring. The method can be equivalent to a traditional spiral spectrum analysis method, the problem that the number of harmonic discrete points of all orders on a receiving plane is large is solved, under the same quality evaluation performance, the complex calculation amount of traditional spiral spectrum component calculation is effectively reduced, and the essence of vortex beam spiral spectrum analysis can be deeply understood.

Description

technical field [0001] The invention belongs to the field of electromagnetic vortex, in particular to a method for analyzing the helical spectrum of a vortex beam based on loop integration in a microwave frequency band. Background technique [0002] The angular momentum carried by electromagnetic waves is divided into spin angular momentum and orbital angular momentum. The vortex beam is a kind of electromagnetic wave carrying orbital angular momentum. It is an annular beam with zero axial intensity in the propagation direction and a phase with a spiral rising or falling gradient distribution. Its expression changes with the cylindrical coordinate azimuth φ Spiral phase factor e ilφ . [0003] The research on electromagnetic orbital angular momentum was first carried out at optical frequency. After that, the experiment of using radio frequency OAM wave for data transmission shows that the multiplexing based on OAM mode can greatly improve the utilization rate of wireless ...

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Application Information

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IPC IPC(8): G06F30/20
CPCG01J3/28G01J11/00G06F30/20
Inventor 李伟文阳光安铖孙泽飞张磊李杰
Owner XIAMEN UNIV
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