A Method of Helix Spectrum Analysis of Vortex Beams Based on Loop Integral

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

CN113128037BActive Publication Date: 2022-05-10XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-05-10

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Abstract

The invention discloses a vortex beam helical spectrum analysis method based on loop integral, which belongs to the field of electromagnetic vortex. The method comprises the following steps: 1) determining the loop integral radius for loop integral helical spectrum analysis; 2) determining the key parameters for obtaining the value of the loop integral radius according to the expression characteristics of the loop integral radius, including: torus distance, beam waist radius, coherence 3) After determining the value of the integral radius of the loop, the phase distribution, OAM order, amplitude distribution, and power distribution on the closed loop are obtained according to the vortex wave field distribution; 4) Determine the harmonics of each order on the closed loop Helical Spectrum Distribution. It can be equivalent to the traditional helical spectrum analysis method, solve the problem of a large number of discrete harmonic points of each order on the receiving plane, and effectively reduce the complex calculation amount of the traditional helical spectrum component calculation under the same quality evaluation performance, which is helpful for in-depth understanding The essence of vortex beam helical spectrum analysis.
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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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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 v...