Achromatic metalens design method and achromatic metalens thereof

A design method and achromatic technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of unsatisfactory effects of meta-lenses, unsatisfactory effects, and reduced area, so as to reduce the number of scans and design time, Reasonable design and easy production

Active Publication Date: 2019-05-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Achromatic metalens design method and achromatic metalens thereof
  • Achromatic metalens design method and achromatic metalens thereof
  • Achromatic metalens design method and achromatic metalens thereof

Examples

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Embodiment 1

[0040] A design method of an achromatic meta-lens, as shown in Figure 1-2, takes an achromatic meta-lens with three layers of the first nano-unit 2, the second nano-unit 4 and the third nano-unit 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 respectively three, and the total degree of freedom of the three-layer superposition is nine, including the following steps:

[0041] S1 determines the total degrees of freedom of the individual nano-units 2, 4, and 6, and sets the required incident light band, and then sets the range and interval of the geometric parameters of each degree of freedom. The geometric parameters of each degree of freedom of , 4 and 6 are simulated and scanned to obtain the phase shift and transmittance of the incident light band produced by a single nano-unit 2, 4, and 6 under different combinations of geometric parameters;

[0042] S2 changes the wavelength band of the incident light, a...

Embodiment 2

[0050] An achromatic metal lens, such as figure 2 , 4 , 5, the achromatic meta-lens design method described in Embodiment 1 is adopted, including a substrate 1 and a multi-layer nano-unit 2, 4, and 6 that are arranged on one side of the substrate 1 and are stacked and combined. Units 2, 4, and 6 are of sub-wavelength size, and the multilayered nano-units 2, 4, and 6 are stacked and combined according to the Fresnel hyperbolic law: Arrange, where x, y are the coordinates of each nano-unit, is the phase shift of the nano-unit, λ is the target wavelength, n is the refractive index of the material background, f is the design focal length, and C(λ) is the initial phase constant.

[0051] like figure 2 , 4 As shown in , 5, taking a three-layer superimposed achromatic metalens as an example, the first nano-unit 2 and the second nano-unit 4 are monocrystalline silicon cylindrical nano-units, and the third nano-unit 6 is a silicon nitride cylindrical nano-unit unit. Wherein, an...

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Abstract

The invention relates to the technical field of optical lenses, particularly to an achromatic metalens design method and an achromatic metalens thereof. The achromatic metalens design method comprisesperforming analog scanning on every degree of freedom geometrical parameter of every single nano unit through a numerical simulation method, performing numerical adding on phase shift produced by nano units with different geometrical parameter combinations, performing numerical multiplication on transmittance to acquire the total phase shift and the total transmittance of superposed multilayer nano units, performing superposition combination on the nano units with appropriate units, and arranging the superposed nano units according to the corresponding Fresnel hyperbolic-type laws corresponding to every target wavelength to obtain the achromatic metalens. By performing parameter design, superposition combination and arrangement on the nano units forming the achromatic metalens, the achromatic metalens can act on multiple target wavelengths and eliminate the influence of color difference brought about by traditional lenses, and the area of the achromatic metalens can be increase to thecentimeter scale or above.

Description

technical field [0001] The invention relates to the technical field of optical lenses, and more particularly, to a design method of an achromatic meta-lens and an achromatic meta-lens thereof. Background technique [0002] Metasurfaces are artificially fabricated materials with subwavelength thicknesses that modulate electromagnetic waves mainly through photonic resonance. Their properties are based on the ability to control the phase and polarization of light using subwavelength-scale dielectrics or metallic nanoresonators. Correspondingly, metasurfaces can change the properties of each phase, polarization, and intensity of transmitted or reflected light beams, and realize various extraordinary optical phenomena such as deflection, retroreflection, polarization conversion, focusing, and beam shaping. Focusing anamorphic surfaces, commonly referred to as metalenses, whose subwavelength nanostructures can provide more precise and efficient phase control than binary amplitude...

Claims

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Application Information

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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
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