A Broadband Achromatic Device Based on Dielectric Metasurface
An achromatic and metasurface technology, applied in the direction of instruments, polarizing elements, optical elements, etc., can solve the problems of increasing the weight, complexity, cost, and limited use of the optical system, so as to reduce the volume and cost, and improve the performance and size , low-cost effect
Active Publication Date: 2020-11-10
HEFEI UNIV OF TECH
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While this strategy is successful, it adds weight, complexity, and cost to optical systems, greatly limiting their use
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0027] refer to Figure 1-5 , a broadband achromatic device based on a dielectric metasurface, including a device body 1, the device body 1 includes a dielectric rectangular block 12 on the upper layer and a substrate 11 on the lower layer, and its achromatic analysis includes the following steps: using the geometric phase and the propagation phase The wavefront of the incident left-handed circularly polarized light and the elimination of chromatic aberration are controlled separately by means of a combination of bits and pieces. After that, the size of the dielectric rectangular block 12 is cut to construct a metasurface array, and the device is realized by extractin...
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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.
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...
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IPC IPC(8): G02B1/00G02B5/30G02B27/00
CPCG02B1/002G02B5/3083G02B27/0012
Inventor 郭忠义郭凯周红平陈蕾
Owner HEFEI UNIV OF TECH