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Design method of a kind of achromatic metalens and achromatic metalens

A design method and achromatic technology, applied in optical components, instruments, optics, etc., can solve the problems of unsatisfactory meta-lens effect, unsatisfactory effect, and reduced area, so as to reduce processing complexity and scan scanning. Number of times, the effect of increasing the area

Active Publication Date: 2021-06-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing metalenses often only act on specific wavelengths, and the effects in bands other than specific wavelengths are often unsatisfactory; if it is necessary to achieve achromatic focusing of a wide spectral band on a single-layer metalens, its area Limited by the formula R_max NAΔω≤2cΔΦ, the area is greatly reduced (where R_max is the lens radius, NA is the numerical aperture, Δω is the spectral width, c is the speed of light in vacuum, and ΔΦ is the phase dispersion interval)
In addition, most metalenses are polarization-dependent, which has strict requirements on the incident light and is easily affected by stray light of different polarization states.
The above limitations lead to the unsatisfactory effect of metalenses in practical applications

Method used

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  • Design method of a kind of achromatic metalens and achromatic metalens
  • Design method of a kind of achromatic metalens and achromatic metalens
  • Design method of a kind of achromatic metalens and achromatic metalens

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Embodiment 1

[0040] A design method of an achromatic metalens, as shown in Figure 1-2, taking the achromatic superlens stacked by three layers of the first nanounit 2, the second nanounit 4 and the third nanounit 6 as an example, The degrees of freedom of the first nano-unit 2, the second nano-unit 4 and the third nano-unit 6 are three respectively, and the total degrees of freedom of the three-layer stacking are nine, including the following steps:

[0041] S1 Determine the total degrees of freedom of individual nano-units 2, 4, and 6, and set the required incident light band, then set the range and interval of the geometric parameters of each degree of freedom, and then use the numerical simulation method to separately analyze the nano-units 2 , 4, and 6 are simulated and scanned for each degree of freedom geometric parameters, so as to obtain the phase shifts and transmittances of the incident light bands produced by the individual nano-units 2, 4, and 6 under different geometric paramet...

Embodiment 2

[0050] An achromatic metalens, such as figure 2 , 4 , 5, using the achromatic metalens design method described in Embodiment 1, including a substrate 1 and a multilayer nano-unit 2, 4, 6 that is arranged on one side of the substrate 1 and is stacked and combined, the nanometer Units 2, 4, and 6 are sub-wavelength sizes, and the multilayer nano-units 2, 4, and 6 after stacking and combining follow the Fresnel hyperbolic law: Arranged, where x, y are the coordinates of each nanometer unit, is the phase shift of the nanometer unit, λ is the target wavelength, n is the refractive index index of the material background, f is the design focal length, and C(λ) is the initial phase constant.

[0051] Such as figure 2 , 4 , 5, taking the achromatic metalens stacked by three layers as an example, the first nano-unit 2 and the second nano-unit 4 are single-crystal silicon cylindrical nano-units, and the third nano-unit 6 is a silicon nitride cylindrical nano-unit unit. Wherein, a...

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Abstract

The present invention relates to the field of optical lens technology, and in particular to a design method of an achromatic meta-lens and the achromatic meta-lens. The present invention first uses a numerical simulation method to simulate and scan the geometric parameters of each degree of freedom of a single nano-unit, and then The phase shifts produced by the nano-units with different combinations of geometric parameters are numerically added, and the transmittances are numerically multiplied in order to obtain the total phase shift and total transmittance of the stacked multi-layer nano-units, and then the nano-units with appropriate parameters The units are stacked and combined, and the stacked nano-units are arranged according to the Fresnel hyperbolic law corresponding to each target wavelength, thereby obtaining an achromatic metalens. In the present invention, the nano-units forming the achromatic meta-lens are parameterized, stacked, combined, and arranged so that the achromatic meta-lens can act on multiple target wavelengths, thereby eliminating the influence of chromatic aberration caused by traditional lenses. And the area of ​​the achromatic metalens can be increased to centimeter level or above.

Description

technical field [0001] The present invention relates to the technical field of optical lenses, and more specifically, relates to a design method of an achromatic meta-lens and the achromatic meta-lens. Background technique [0002] Metasurfaces are man-made materials at the sub-wavelength level, which modulate electromagnetic waves mainly through photon resonance. Their properties are based on the ability to control the phase and polarization of light using sub-wavelength dielectrics or metallic nanoresonators. Correspondingly, the metasurface can change the phase, polarization, intensity and other properties of the transmitted or reflected beam, and realize various extraordinary optical phenomena such as deflection, retroreflection, polarization conversion, focusing and beam shaping. Focusing deformable surfaces, commonly referred to as metalenses, whose subwavelength nanostructures can provide more precise and efficient phase control than binary amplitude and phase Fresne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B1/00
Inventor 梁浩文冯伟彬李俊韬孙茜刘志浩
Owner SUN YAT SEN UNIV