Design method of annular vortex array mask plate with controllable vortex number

A technology of annular vortex and design method, which is applied in the field of particle light manipulation and optical testing, and can solve problems such as difficult to generate annular vortex arrays

Inactive Publication Date: 2017-07-07
HENAN UNIV OF SCI & TECH
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Problems solved by technology

However, all the above schemes are difficult to produce an annular v

Method used

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  • Design method of annular vortex array mask plate with controllable vortex number
  • Design method of annular vortex array mask plate with controllable vortex number
  • Design method of annular vortex array mask plate with controllable vortex number

Examples

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Embodiment

[0045] Taking a mask with a size of 512×512 as an example, an annular vortex array mask with controllable vortex number is given for a laser with a working wavelength of 532nm. The cone angle of the mask plate cone lens is respectively taken as Parameter Selection of Helical Phase Factor Topological Chargel 1 =5, l 2 Taking 2 as an interval from 4 to -4 in turn, according to the transmittance function of the mask in the specific embodiment, the annular vortex array mask with controllable number of vortexes is finally obtained. figure 1 The masks generated under different topological charge values ​​are given. The annular vortex array mask plate with controllable vortex number can be realized by a spatial light modulator. Take the RL-SLM-R2 spatial light modulator of Beijing Xinglin Ruiguang as an example, the pixel size is 12.3μm, and the fill factor is 90%.

[0046] figure 2 As shown, the light intensity distribution of the annular vortex array mask with controllable v...

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Abstract

The invention relates to a design method of an annular vortex array mask plate with controllable vortex number. By means of computer generated hologram principle, light beam complex amplitude computational simulation is carried out to superimpose two perfect vortex beam mask plates with different radii, so that an annular vortex array can be generated in a far field. Cone angles of two axicon lens are adjusted to control the light ring superposition degree of concentric perfect vortexes, thus achieving generation of an annular vortex array. The annular vortex array can achieve arbitrary control of the dark nuclear number of the ring, thus having very important application prospects in particle manipulation technology.

Description

technical field [0001] The invention relates to the field of particle light manipulation and optical testing, in particular to a design method of a ring vortex array mask plate with controllable vortex number. Background technique [0002] The optical vortex carries orbital angular momentum and has a wide range of applications in optical trapping and manipulation of tiny particles. It has become a very important research hotspot in the field of information optics in recent years. The vortex array, as one of the main forms of optical vortex, is an important research hotspot in the research directions of multi-optical trap trapping in the field of micro-manipulation, and cold atom cluster trapping with special morphology. In these applications, the shape distribution of the vortex array has important research significance. [0003] A lot of research has been done on the generation of vortex arrays, but they mainly focus on square vortex arrays. In 2008, S.C.Chu et al. used ...

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Application Information

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IPC IPC(8): G03F1/70G21K1/00
CPCG03F1/70G21K1/003G21K1/006
Inventor 李新忠马海祥台玉萍李贺贺王静鸽唐苗苗
Owner HENAN UNIV OF SCI & TECH
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