Optical device with disordered functional element configuration

Abstract

The invention provides an optical device with disordered functional element configuration. The optical device comprises a substrate and a non-periodic micro-nano structure array of disordered functional elements which are sequentially arranged along an electromagnetic wave propagation direction, the surface of the substrate is a plane or a curved surface, the non-periodic micro-nano structure array of the disordered functional elements is a micro-nano structure array formed by aperiodically distributing a plurality of functional elements with disordered internal structures on a plane or a curved surface; and the internal structure of each functional element distributed in the optical device is determined according to the phase distribution of the optical device. According to the optical device, the disordered structure serves as the functional element, on one hand, the strong coupling phenomenon between functional elements of regular configuration based on homogeneous materials is eliminated, and on the other hand, the randomness and diversity of the disordered structure are utilized, the design freedom degree of the optical device is increased, and the parameter space of the functional element is expanded; and therefore, the light field regulation and control capability and the optical device performance are obviously improved.

Description

technical field [0001] The application belongs to the field of metasurface optical devices, and in particular relates to an optical device with a disordered functional unit configuration. Background technique [0002] A metasurface refers to an array of micro-nano structures composed of optical scattering structures with a characteristic size of sub-wavelength as functional units and distributed on a plane or curved surface. Its main function is to adjust the phase, amplitude, and polarization of incident light. , frequency, so that the beam wavefront is modulated accordingly according to the distribution of functional primitives. Therefore, compared with traditional optical devices, metasurface optical devices have flexible light control properties, showing significant advantages in the fields of optics and electromagnetics. [0003] At present, the metasurface optical devices researched at home and abroad mostly use heterogeneous materials (that is, the substrate is made ...

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Problems solved by technology

[0004]However, the design method of heterogeneous metasurface optical devices cannot be directly applied to homogeneous metasurface optical devices, because: the current research on heterogeneous metasurface optical devices is commonly used Regular configurations such as cylinders, square columns, and rectangular columns, and metasurfaces based on homogeneous materials, if their functional units also adopt the above structure, there will be strong coupling between adjacent functional units, thus destroying the metasurface’s effect on the wavefront. Precise tuning to influence the performance of metasurface optics

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