Cylindrical vector beam lens with adjustable polarization order and continuous zooming and its construction method

Abstract

The invention provides a cylindrical vector beam lens with adjustable polarization order and continuous zooming, which includes two cascaded metasurface arrays, each metasurface array includes a plurality of nano-brick structural units, and the nano-brick structural unit includes a working surface And the nano bricks arranged on the working surface; when the two cascaded metasurface arrays are incident with linearly polarized light, a cylindrical vector beam is generated; when the linearly polarized light is incident, the first metasurface array is fixed, and the second metasurface array is rotated around the optical axis. sheet metasurface array, realizing the continuous adjustment and continuous zooming of the polarization order of the outgoing cylindrical vector beam; the present invention also provides the construction method of the above-mentioned cylindrical vector beam lens, the method determines the steering angle arrangement of the nano bricks according to the adjustment range of the polarization order, according to The adjustment range and precision of the focal length determine the arrangement of the size parameters of the nano-bricks. The invention can realize the generation and continuous zooming of cylindrical vector beams of any order, and solves the problems of complex optical system and difficulty in continuous zooming in the current generation of cylindrical vector beams.

Description

technical field [0001] The invention belongs to the field of micro-nano optics technology, and in particular relates to a cylindrical vector beam lens with adjustable polarization order and continuous zooming and a construction method thereof. Background technique [0002] A vector beam refers to a beam whose polarization state is not uniformly distributed in space. Cylindrical vector beams are the most special type of vector beams, and their polarization states are axisymmetrically distributed in the cross section. Due to the existence of a polarization singularity at the coordinate origin, the light intensity of the cylindrical vector beam is distributed in a ring shape. The main defects of the active and passive methods currently used to generate cylindrical vector beams are the complexity of the optical system, poor stability, and high cost, and the adjustment of the polarization order of the generated cylindrical vector beams often involves multiple optical systems. C...

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Problems solved by technology

[0004] The object of the present invention is to address the deficiencies of the prior art, to provide a cylindrical vector beam lens with adjustable polarization order and continuous zooming, so as to solve the problems in the prior art that the cylindrical vector beam generating optical system is complex and difficult to install and adjust. Technical problems such as high requirements, poor stability, high cost, difficulty in dynamically adjusting the polarization order, and difficulty in achieving continuous zoom

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