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Design method of free-adjustable central symmetric vortex beam mask

A centrosymmetric, vortex beam technology, applied in optics, optical components, instruments, etc., can solve problems such as lack of

Inactive Publication Date: 2019-06-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] To sum up, in the field of particle manipulation, there is still a lack of a centrosymmetric vortex beam with controllable lobe size and ring radius that can be used for particle manipulation to meet the needs of particle manipulation, especially for the separation of cell clusters

Method used

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  • Design method of free-adjustable central symmetric vortex beam mask
  • Design method of free-adjustable central symmetric vortex beam mask
  • Design method of free-adjustable central symmetric vortex beam mask

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Embodiment

[0040] Taking a mask with a size of 512×512 as an example, a centrosymmetric vortex beam mask is given for a laser with a working wavelength of 532nm. The cone angle α of the axicon lens is selected as 0.06°, and the phase reconstruction factors PRF are respectively taken as 4, 6, 8, and 10. According to the transmittance function of the mask plate in the specific embodiment, a centrosymmetric vortex with controllable light lobe size is finally obtained. Beam mask. figure 1That is, the phase mask of the centrosymmetric vortex beams with different phase reconstruction factors PRF used in the embodiment. The phase reconstruction factor PRF is selected as 4, and the cone angles α of the axicon are 0.03°, 0.04°, 0.05°, and 0.06° respectively. According to the transmittance function of the mask plate in the specific embodiment, a centrally symmetrical vortex with a controllable halo radius is finally obtained. A mask for rotating beams. image 3 That is, it is the phase mask of t...

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Abstract

The invention provides a design method of a free-adjustable central symmetric vortex beam mask. The complex transmittance function t of the central symmetric vortex beam mask is obtained by combininga central symmetric spiral phase factor, a cone lens transmittance function and a blazed grating; and the complex transmittance function t is loaded into a spatial light modulator by a computer so asto obtain the free-adjustable central symmetric vortex beam mask. The designed mask can generate the central symmetric vortex beam with adjustable optical lobe size and optical ring radius in the farfield of the mask; The size of optical lobes on the left and right sides of the ring is controlled by the phase reconstruction factor (PRF), and the radius of the optical ring is controlled by the cone angle of a cone lens, and the method has quite important application prospect in the field of particle manipulation.

Description

technical field [0001] The invention relates to the field of particle manipulation, in particular to a design method of a freely adjustable centrosymmetric vortex beam mask. Background technique [0002] Since the optical vortex carries orbital angular momentum, it is widely used in particle manipulation, high-capacity optical communication, optical measurement and astronomical observation and other fields. In the field of particle manipulation, the light intensity and orbital angular momentum of the vortex beam provide the gradient force and angular optical wrench force, respectively. Therefore, it is very meaningful to develop new technologies to control its light intensity and orbital angular momentum distribution. [0003] There have been a lot of research work on the control of the orbital angular momentum of vortex beams, and the most common method is to control its topological charge [Phys.Rev.A45,8185-81891992]. However, this method can only change the magnitude of...

Claims

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Application Information

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IPC IPC(8): G02B27/00G02B27/09
Inventor 李新忠张浩马海祥
Owner HENAN UNIV OF SCI & TECH
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