Planar optical device capable of generating vertex light fields in double channels of near field and far field simultaneously and design and preparation of planar optical device

A technology of optical devices and vortex light, applied in optical components, optics, instruments, etc., to achieve the effect of broad application prospects
CN110286429AActive Publication Date: 2019-09-27PEKING UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
PEKING UNIV
Publication Date
2019-09-27

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Abstract

The invention discloses a planar optical device capable of generating vertex light fields in doubles channels of a near field and a far field simultaneously and a design method and a preparation method of the planar optical device. According to the planar optical device, simultaneous generation of the vertex light fields in the two channels of the near field and the far field is realized for the first time by use of a metallic super-structure surface material, wherein a focused surface plasmon vertex light field exists in the near field, a focused free space vertex light field exists in the far field, and topological loads carried in the vertex light fields generated in the two channels can be flexibly matched according to demands. The planar optical device which is designed by use of the method and can generate the double-channel vertex light fields has an important meaning for a high-density communication and multifunctional integrated optical system based on the vertex light fields in the future.
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Description

technical field

[0001] The invention relates to a planar optical device, in particular to a light field manipulation device based on a metal surface plasmon metasurface material and a design method thereof, which can be used to design a The channel is a planar optical device for generating a vortex light field, and any configuration of the topological charge of the vortex light field generated by the two channels can be realized as required. Background technique

[0002] The vortex light field is a special light field mode in which the wavefront has the characteristics of a spiral phase distribution. Compared with the ordinary light field, because its wavefront is a spiral phase distribution, a phase singularity will be generated in the center of the beam, and the light intensity at this singularity is zero, so that the cross section of the vortex beam shows a doughnut-shaped circle Ring light intensity distribution. On the other hand, compared to ordinary circularly polar...

Claims

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