Meta-structure surface member generating nanometer scale vertical light spot chain and generation method thereof

Abstract

The invention discloses a meta-structure surface member generating a nanometer scale vertical light spot chain and a generation method thereof. Nanometer antennas of different orientations and sizes perform scattering on incident light. Phases of diffusion light are abruptly changed differently. Nanometer antennas of different orientations are constituted into an array according to a certain ruleso as to form a metal-structure surface member, and thus equal interval multi-point focusing along an axial direction on incident circularly polarized light is realized and a light spot chain is produced. During a designing process, the surface of a material is divided into square unit arrays, wherein the square unit is of a sub-wavelength size. When the center of the square unit is arranged on adetermined radius and azimuth, a corresponding phase modulation value is applied. Phase modulation is completed by cuboid nanometer antennas which are embedded in the square units and have different orientations. Circular polarized light goes into the meta-structure surface member to generate a nanometer scale vertical equal interval light spot chain. The meta-structure surface member generating the nanometer scale vertical light spot chain and the generation method thereof can form minisize optical tweezer probes for vertically arranging or piling controlled nanometer particles.

Description

technical field [0001] The invention relates to a metasurface element, in particular to an artificial metasurface element capable of producing nanometer-scale longitudinal light spot chains, and also relates to a method for generating nanometer-scale longitudinal light spot chains based on the element. Background technique [0002] Since metal or dielectric nanoantennas of different sizes or orientations can produce phase mutation effect and polarization selection effect on incident light scattering, various nanoantenna arrays required for phase modulation can be processed by using coating technology and modern micromachining technology on the substrate surface , so as to obtain various metasurface elements and devices that modulate the phase and polarization of incident light, such as polarization converters, beam splitters, dispersion elements, achromatic focusing lenses, etc. The thickness and size of such devices can usually be on the order of microns, so they are extrem...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no miniature optoelectronic material or device that can replace the traditional combination of high numerical aperture objective lens and phase modulation element to produce a longitudinally equidistant spot chain

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