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Metasurface lens for realizing lateral multifocal focusing and its realization method

A metasurface, multi-focus technology, applied in instruments, polarizing elements, optics, etc., to achieve the effect of easy integration

Active Publication Date: 2019-10-11
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is currently no metasurface lens that can generate lateral multifocals using nanoantenna arrays

Method used

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  • Metasurface lens for realizing lateral multifocal focusing and its realization method
  • Metasurface lens for realizing lateral multifocal focusing and its realization method
  • Metasurface lens for realizing lateral multifocal focusing and its realization method

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Embodiment Construction

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Apparently, the described embodiments are some, but not all, embodiments of the present invention.

[0032] First determine the radius of the lens to be designed, the material of the lens substrate, the focal length, and the number of focal points. In this embodiment, the lens radius is 100 microns, the base material is quartz material with a thickness of 0.17 mm, the focal length is 90 microns, the number of focal points is 10, and the laser wavelength used is 633 nanometers. The lens is designed, manufactured and verified according to the following steps.

[0033] Step 1: As attached figure 1 As shown, the material of the nano-antenna array is selected according to the wavelength...

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Abstract

The invention discloses a metasurface lens capable of transverse multi-point focusing and a realization method therefor. The metasurface lens is partitioned into sub-wavelength square array units, each square unit is further divided into square pixel units with reduced sizes. A slit formed by certain pixels in a set length breadth ratio is nested in each sub-wavelength square unit. Twice the azimuth angle orientation of the slip corresponds to a phase modulation value of the unit. The phase modulation value is formed via superposition of two parts, a spherical wave which changes along a radialdirection is generated via a part of the phase modulation value while the other part of the phase modulation value which changes along an azimuth angle direction is determined based on a Fourier transform phase shift theorem. The slit, of which the azimuth angle orientation is determined, in each sub-wavelength square array unit is made into a titanium dioxide cuboid array metasurface lens with corresponding orientation. Multi-point focusing in a focal plane can be realized via circularly polarized light incidence.

Description

technical field [0001] The invention relates to a metasurface lens, in particular to a metasurface lens capable of realizing lateral multi-focus focusing, and also relates to a method for realizing lateral multi-focus focusing based on the lens. Background technique [0002] Traditional optical lenses achieve focusing by adjusting the phase of incident light through changes in the thickness of the glass. Such lenses are bulky and heavy. With the continuous development of integrated photonic devices, traditional optical devices including lenses obviously cannot meet the requirements of large-scale integration and device miniaturization and functional diversification. [0003] Due to the phase modulation of the incident light by metal or dielectric nano-antennas, various nano-antenna arrays required for phase modulation can be processed on the surface of the substrate by using coating technology and modern micro-processing technology, so as to realize the phase and polarizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02B1/00
Inventor 陈建农朱林伟徐钦峰李志刚
Owner LUDONG UNIVERSITY