Broadband achromatic device based on medium super-surface

An achromatic and metasurface technology, applied in the direction of instruments, optical components, polarizing components, etc., can solve the problems of increasing the weight, complexity and cost of the optical system, restricting the use, etc., to reduce volume and cost, improve performance and size , low-cost effect
CN110333560AActive Publication Date: 2019-10-15HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2019-10-15

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Abstract

The invention discloses a broadband achromatic device based on a medium super-surface, relating to the field of new artificial composite material super-surfaces. The device comprises a device body, the device body comprising a dielectric rectangular block positioned on an upper layer and a substrate positioned on a lower layer. The achromatic analysis thereof comprises the steps of using a mannerof combining a geometric phase with a propagation phase to respectively control wavefront of an incident left-handed circularly polarized light and eliminate chromatic aberration; then performing sizetrimming to construct a super-surface array; and realizing analysis on the achromatic characteristic of the device body by extracting and processing right-handed circularly polarized energy of a detection surface. On one hand, the broadband achromatic device in the invention utilizes a method of combining two phases; and on the other hand, realizes achromatic in a continuous bandwidth range, thereby greatly reducing volume and cost thereof as compared with a past device.
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Description

technical field

[0001] The invention relates to the field of novel artificial composite material metasurfaces, in particular to a broadband achromatic device based on dielectric metasurfaces. Background technique

[0002] Wavelength dispersion is an important property of optical materials and has always played an important role in the design of optical components and systems. In most media, like glass, the refractive index decreases with increasing wavelength, which is called normal dispersion. With this material, a refractive lens will have a larger focal length at longer wavelengths than at shorter wavelengths, and the prism will deflect at a smaller angle. This chromatic aberration severely degrades the performance of panchromatic optical applications, such as communication, detection, imaging, display, etc.

[0003] Traditionally, chromatic aberration is eliminated by the integration of several different materials whose refractive index has an inverse relationship with...

Claims

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