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Advanced functional materials: single cell three function super surface based on triple light manipulation

wallpapers Cruise 2020-07-04
As a synthetic sub wavelength two-dimensional material

super surface has the ability to control many kinds of light parameters at the same time such as amplitude polarization phase control so on which brings the possibility to design integrated optical devices with multiple optical functions at the same time. However limited by the design freedom of nanostructures only two different optical functions can be realized simultaneously by using the super surface. In the limited design freedom changing any geometric parameters of nanostructures will lead to other optical properties change causing unnecessary chain reaction. As a solution two or more nanostructures can be arranged into supercells to design spatially staggered or stacked hypersurfaces realize complex amplitude or independent spectral phase manipulation construct multifunctional hypersurfaces that can simultaneously realize nanoprinting computational holography. However the essence of the above method is to integrate two (or more) super surfaces into one super surface. Each nanostructure can only record information of one channel at most so it does not increase the information density of a single super surface.

To solve this problem inspired by the angular degeneracy of nanostructures Professor Zheng Guoxing's team of Wuhan University their collaborators separated the manipulation of spectrum polarization phase of a single nanobrick by designing different incident excitation working light paths realized the triple light manipulation of a single cell nanobrick proposed a method for displaying structural color images continuous gray images at the same time The three-dimensional image the three-dimensional holographic image of the cell super surface. In this work the spectral polarization phase information can be perfectly stored in the three functional super surface of the same unit cell structure: the color information of the structural color image is stored in the geometric size of the unit cell nano brick structure; the intensity information of the continuous gray image the phase information of the hologram are stored in the corner arrangement of the unit cell nano structure at the same time. Therefore structural color image continuous gray image holographic image can be simultaneously recorded on a super surface each nanostructure corresponds to the pixel information of three images. The structure color image continuous gray image four step phase hologram can be reconstructed on the surface of the sample in the far field by using different illumination sources working light paths. This study shows that supercell stack are not the only way to achieve multi-functional optical manipulation. By flexibly designing the incident excitation working optical path we can make better use of the design freedom contained in the nanostructure use a nanostructure to achieve multi-functional optical manipulation overcome the limitation of super surface information storage density. The triple optical manipulation of single-cell nanostructures exps the optical manipulation dimension of nanostructures provides a highly integrated high information density multi-functional super surface design method has broad application prospects in information encryption high-density image storage display optical anti-counterfeiting other related fields
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