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A Super Apochromatic Metasurface Composite Microlens

An apochromatic and micro-lens technology, applied in the optical field, can solve the problems of complex optical system to correct chromatic aberration, sacrificing bandwidth and numerical aperture, etc., to achieve the effect of eliminating chromatic aberration, simple structure and reducing bandwidth

Active Publication Date: 2020-07-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only solves the technical problem that positive refractive index materials require a complex optical system to correct chromatic aberration, but also solves the technical problem that metasurface materials need to sacrifice bandwidth and numerical aperture in order to correct chromatic aberration

Method used

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  • A Super Apochromatic Metasurface Composite Microlens
  • A Super Apochromatic Metasurface Composite Microlens
  • A Super Apochromatic Metasurface Composite Microlens

Examples

Experimental program
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Embodiment 1

[0031] Embodiment 1: Common metasurface composite microlens.

[0032] Such as figure 1 Shown is a structural diagram of a super apochromatic metasurface composite microlens provided in this embodiment. This embodiment consists of a first lens and a second lens, the first lens is a metasurface lens with positive power, and the second lens is a refractive microlens with positive power. Among them, the positive power metasurface lens has negative dispersion properties to produce negative chromatic aberration, and the positive power spherical refraction microlens has positive dispersion properties to produce positive chromatic aberration. The numerical aperture and positive power spherical surface of the positive power metasurface lens are optimized by numerical simulation software FDTD The refractive spherical curvature of the refractive lens makes the above two lenses produce chromatic aberrations of equal size and opposite signs at all wavelengths in the designed working band,...

Embodiment 2

[0040] Embodiment 2: A metasurface composite microlens with partially corrected chromatic aberration.

[0041] This embodiment provides a partially corrected super apochromat metasurface composite microlens for chromatic aberration. The system aperture size is 50um, the total focal length of the system is 30.3um, the working wavelength range is 580nm-780nm, and the numerical aperture (NA) is 0.635. It can achieve no chromatic aberration focusing in the working wavelength range, and the secondary spectrum is less than 1um. Its structure diagram is as follows Figure 6 shown.

[0042] For the present invention, if the negative chromatic aberration produced by the first lens exceeds the chromatic aberration compensation capability produced by the second lens, the nano-antenna array itself of the first lens can be designed to partially correct the chromatic aberration structure, which can also achieve high numerical value of the system. Aperture free focusing with no chromatic a...

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Abstract

The invention discloses a super apochromatic supersurface composite microlens, which comprises a first lens and a second lens, wherein the first lens is a positive-focal power supersurface lens with anegative dispersion property, and the particular structure is a nano-antenna array with a wide spectral response; the second lens is a positive-focal power spherical reflection microlens with a positive dispersion property, and the particular structure is a flat convex spherical microlens; the first lens comprises an upper surface and a lower surface of the nano-antenna array; the second lens comprises a second lens plane side and a second lens curved surface; the lower surface of the first lens is mutually overlapped with the plane side of the second lens; and the nano-antenna array of the first lens is embedded inside the curved surface of the second lens. The technical problems that a complex optical system is needed for chromatic aberration correction of a positive-refractive index material, and the supersurface material needs to sacrifice a bandwidth and a numerical aperture in order to correct the chromatic aberration can be solved, and the super apochromatic supersurface composite microlens has the advantages of simple structure and miniaturization.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a super apochromatic metasurface composite microlens. Background technique [0002] Chromatic aberration correction has long been one of the key points in traditional optical design. Traditional optical elements are mostly refractive optical elements. Unfortunately, the refractive index of optical materials in refractive optical elements is not only related to the physical properties of the material itself, but also to the light. related to the wavelength. For the same optical material, the shorter the wavelength and the higher the refractive index, the degree of deflection to different colors of light is different, resulting in dispersion. Different optical materials also tend to have different dispersions. It is precisely because of the dispersion of optical materials that inevitably leads to chromatic aberration, and the traditional optical design requires an extremely comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00
CPCG02B3/0006G02B3/0012G02B3/0037
Inventor 文静刘仕良张大伟
Owner UNIV OF SHANGHAI FOR SCI & TECH