Method of constructing ultrathin color optical lens based on artificial microstructure super surface

An artificial microstructure and optical lens technology, applied in the fields of geometric optics and micro-nano optics, can solve problems such as large chromatic aberration, achieve low loss, high transmittance, and reduce the range of focal length variation.

Active Publication Date: 2016-11-09
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

The current artificial microstructure metasurface lens technology has a huge

Method used

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  • Method of constructing ultrathin color optical lens based on artificial microstructure super surface
  • Method of constructing ultrathin color optical lens based on artificial microstructure super surface
  • Method of constructing ultrathin color optical lens based on artificial microstructure super surface

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Embodiment 1

[0064] Effect of Artificial Microstructured Metasurface Constructed Supercolor Thin Optical Lens.

[0065] According to the above design method, design a color ultra-thin optical lens with working wavelengths of 420nm, 550nm, and 700nm, which is insensitive to polarization, with a diameter of 1.12mm, a focal length of 0.42mm, and a numerical aperture of 0.8.

[0066] The structures designed in Fig. 3 are all circular, the material of the cylinder is TiO2, and the height is 600nm. The surrounding medium is Teflon AF4200, the refractive index in the visible light band is 1.29, and the height is 800nm, that is, both height 2 and height 3 in Figure 3(b) are 100nm. For 420nm working wavelength, the structural period is 200nm; for 550nm working wavelength, the structural period is 350nm; for 700nm working wavelength, the structural period is 400nm. It can be seen from Figures 4, 5, and 6 that as the radius of the cylinder gradually increases, the phase delay (gray curve) decreases ...

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Abstract

The invention discloses a method of constructing an ultrathin color optical lens based on an artificial microstructure super surface, comprising the following steps: (1) calculating the phase distribution on an artificial microstructure super surface according to the position of a focus point needing emergence; (2) designing a rotational symmetry periodic structure for each center wavelength, and determining a specific phase value based on the phase gradient distribution; (3) designing a columnar structure of determined height as a basic unit of the artificial microstructure super surface, and designing a corresponding specific implementation structure; (4) randomly dividing the N regions of an entire lens into m parts, and ensuring that the number of regions in each part is roughly the same according to the need or ensuring that a certain ratio is achieved according to the specific need; (5) taking m selected regions to m corresponding lenses in step (3) to form new lenses; and (6) forming a filter array based on filters of corresponding working wavelengths on the lenses according to the specific wavelength of each region. A color optical lens constructed using the method has the advantages of being ultra-thin, bi-planar and easy to integrate.

Description

technical field [0001] The invention belongs to the fields of geometric optics and micro-nano optics, and in particular relates to a method for constructing ultra-thin color optical lenses based on artificial microstructure metasurfaces. Background technique [0002] Optical lenses are commonly used optical components in people's daily life, including cameras, microscopes, etc., and also play an important role in industrial production and national defense. Usually the lenses used are bulky and have at least one curved surface. However, with the development of science and technology, the functions of human-made equipment are becoming more and more complex. The traditional optical lens is bulky and the curved surface design can no longer meet the increasing integration requirements. How to effectively combine the existing mature semiconductor technology to solve the above problems becomes very important. [0003] Through micro-nano optical technology, manipulating the propag...

Claims

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Application Information

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IPC IPC(8): G02B3/00G02B1/00
CPCG02B1/005G02B3/0012
Inventor 马云贵元军
Owner ZHEJIANG UNIV
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