Intermediate infrared polarization independent broadband achromatic super lens and construction method thereof

An infrared polarization and super-lens technology, which is applied to lenses, polarizing elements, optics, etc., can solve problems such as unfavorable lens focusing efficiency, increase the complexity of optical systems, and improve the quality of imaging.

Active Publication Date: 2021-02-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, focusing is achieved by adjusting the geometric phase, requiring the incident polarized light to be circularly polarized light, which increases the complexity of the optical system and is not conducive to improving the focusing efficiency of the lens

Method used

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  • Intermediate infrared polarization independent broadband achromatic super lens and construction method thereof
  • Intermediate infrared polarization independent broadband achromatic super lens and construction method thereof
  • Intermediate infrared polarization independent broadband achromatic super lens and construction method thereof

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Embodiment 1

[0046] Such as figure 1 , Fig. 2 (a), Fig. 2 (b) shown in Fig. 2 (c), present embodiment provides a kind of mid-infrared polarization-independent broadband achromatic superlens, described superlens comprises substrate and is arranged on described substrate A unit structure, the phase change of the unit structure changes linearly with the angular frequency of the incident light, and the unit structure is used to adjust the phase of the incident light of the metalens.

[0047] The phase change of the unit structure is in,

[0048]

[0049] ω is the angular frequency of incident light, c is the speed of light in vacuum, f is the focal length of the lens, r 0Indicates the maximum radius of the lens, and r is the distance from the center to the edge of the lens at different positions.

[0050] Specifically, such as figure 1 As shown, the sub-wavelength unit structure is constructed using ZnSe material as the phase control unit of the metalens, and the substrate is CaF 2 Ma...

Embodiment 2

[0079] Such as Figure 9 As shown, the present invention also provides a method for constructing a mid-infrared polarization-independent broadband achromatic metalens, the method comprising:

[0080] S1: determine the unit structure of the hyperlens, the unit structure is used to adjust the phase of the incident light of the hyperlens, and its phase change varies linearly with the angular frequency of the incident light;

[0081] S2: Determine the distribution of the effective refractive index of the hyperlens, and arrange the corresponding unit structures on the substrate of the hyperlens according to the required effective refractive index values ​​at different positions of the hyperlens.

[0082] Preferably, the phase change of the unit structure is in,

[0083]

[0084] ω is the angular frequency of incident light, c is the speed of light in vacuum, f is the focal length of the lens, r 0 Indicates the maximum radius of the lens, and r is the distance from the center...

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Abstract

The invention relates to an intermediate infrared polarization independent broadband achromatic super lens and a construction method thereof. The super lens comprises a substrate and a unit structurearranged on the substrate; the phase change of the unit structure is linearly changed along with the angular frequency of incident light; the unit structure is used for adjusting the phase of the incident light of the super lens. According to the intermediate infrared polarization independent broadband achromatic super lens and the construction method thereof of the invention,the unit structure ofwhich the phase changes linearly along with the angular frequency of the incident light is arranged on the substrate, so that hyperbolic phase distribution is obtained on the surface of the super lens, a focusing effect is achieved; the focusing performance of the super lens is not sensitive to the frequency of the incident light, so that a broadband achromatic effect is achieved.

Description

technical field [0001] The invention belongs to the field of artificial microstructure materials, and in particular relates to a mid-infrared polarization-independent broadband achromatic superlens and a construction method thereof. Background technique [0002] Traditional optical components have chromatic aberration problems under broadband incident light, that is, refractive lenses have positive dispersion, and diffractive lenses have negative dispersion effects. The dispersion effect will reduce focusing efficiency and imaging quality. The traditional achromatic design has problems such as complex optical system and difficulty in obtaining broadband achromatic effect. In recent years, with the in-depth study of metasurfaces in light field regulation, metalenses designed based on the principle of metasurfaces have a high degree of freedom of regulation, ultra-thin thickness, and sub-wavelength size structures, which are convenient for integration and miniaturization. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/02G02B5/30
CPCG02B3/02G02B5/3083
Inventor 丁剑平熊文辉沙晨晨汪喜林王慧田
Owner NANJING UNIV
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