Vortex light orbital angular momentum detection method based on soft-edge small hole
A technology of orbital angular momentum and detection method, applied in the field of vortex light and light diffraction transmission, can solve the problem of inability to accurately identify the main bright spot, and achieve the effect of expanding the scope of application, accurate and fast automatic detection, and improving the relative intensity
Pending Publication Date: 2021-12-10
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology
When the relative intensity of the outermost main bright spot and adjacent secondary bright spots is not large, the main bright spot cannot be accurately identified in the diffraction distribution diagram, and at this time the small hole-based vortex light detection method has reached its limit
The detection method based on the triangular hole of Hickmann et al. can only be used to measure the lower order vortex light not exceeding the 10th order
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[0017] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0018] Using small holes (such as rectangular holes, triangular holes, round holes, polygonal holes and various rings, etc.) The number of main bright spots can get the orbital angular momentum of vortex light. Under the condition of lower-order topological charges, the normalized intensity contrast ratio between the main bright spot a...
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The invention discloses a vortex light orbital angular momentum detection method based on a soft-edge small hole. The vortex light orbital angular momentum detection method comprises the following steps: using a soft-edge small hole as a diffraction diaphragm; enabling the vortex light to form far-field diffraction distribution through the soft-edge small holes; determining the orbital angular momentum of the vortex light according to the number of main bright spots in far-field distribution, wherein the soft-edge small hole is a small hole of which the inner edge has a certain degree of softening factor; using the convergence of the soft edge to the diffraction effect to enhance the relative intensity of the outermost main hot spot to the adjacent secondary hot spot in the diffraction distribution, so that the identifiability of the main hot spot and the detectable range of the orbital angular momentum are improved. The small holes can be round, triangular, rectangular, polygonal and various ring shapes; the certain-degree softening factor means that the softening factor can be adjusted and optimized according to specific conditions so as to obtain an optimal detection effect.
Description
technical field [0001] The invention relates to the fields of vortex light and diffraction transmission of light, and in particular to a method for detecting orbital angular momentum of vortex light based on pinholes. Background technique [0002] At present, with the development of wireless communication technology, people's demand for bandwidth capacity of communication network is increasing, but the means based on frequency, wavelength, polarization state and other aspects can no longer increase the capacity of communication system on a large scale, and people begin to turn their attention to vortex beam. A vortex beam is a beam with a helical phase distribution. Since Allen et al. discovered in 1992 that a vortex beam carries orbital angular momentum (OAM), the vortex beam has become a research hotspot in recent years. one. The orbital angular momentum of vortex beams can be used to encode information. OAM has infinite modes, and each mode is orthogonal to each other. ...
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IPC IPC(8): H04B10/079
CPCH04B10/0795
Inventor 熊晗庄京秋
Owner SUZHOU UNIV OF SCI & TECH