Ultra-wideband wide-angle beam splitter based on similar metasurface structure
A metasurface, ultra-broadband technology, applied in the field of ultra-broadband large-angle beam splitters, which can solve problems such as narrow working bandwidth
Pending Publication Date: 2021-12-17
GUILIN UNIV OF ELECTRONIC TECH
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[0003] The purpose of the present invention is to provide an ultra-broadband large-angle beam splitter based on similar metasurface structures, aiming to solve the technical problem of narrow working bandwidth in discrete metasurface structures in the prior art
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[0024] Embodiments of the invention are described in detail below, examples of which are illustrated in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the invention and should not be construed as limiting the invention.
[0025] In describing the invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", " The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or Nothing should be construed as limiting the invention by implying that a referenced device...
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Abstract
The invention discloses an ultra-wideband large-angle beam splitter based on a similar metasurface structure. Each similar metasurface structure is fixedly connected with a substrate and is located at the top of the substrate, and the plurality of similar metasurface structures are periodically distributed along the X direction and the Y direction. According to the ultra-wideband wide-angle beam splitter based on the similar metasurface structure, the transmission intensity of the-1 level and the transmission intensity of the + 1 level in the working wave band are always kept equal. In the range of 678-833nm, the transmissivity of + / -1 diffraction level can be kept at 35% or above, the total transmissivity is greater than 74%, the transmissivity of + 1 order is greater than 35%, and the deflection angle can reach 48.88-67.75 degrees. In most wavelengths in a working wave band, transmission light phases of the ultra-wideband large-angle beam splitter based on the similar metasurface structure can keep a phase difference of pi so that ultra-wideband equal-power beam splitting is realized.
Description
technical field [0001] The invention relates to the technical field of optical beam splitters, in particular to an ultra-broadband large-angle beam splitter based on similar metasurface structures. Background technique [0002] At present, in the research and application of modern optics, metasurfaces have attracted more and more attention from researchers because of their ultrathin structures and the ability to precisely control electromagnetic fields. Metasurface is a special ultra-thin artificial electromagnetic metamaterial, which can flexibly and effectively control the phase, polarization mode, propagation mode and other characteristics of electromagnetic waves at the sub-wavelength scale, and then realize focused imaging, abnormal deflection, and perfect absorption. and polarization rotation. Compared with traditional "bulk metamaterials", metasurfaces have significant advantages of small size, thin thickness, easy preparation and integration, and at the same time, t...
Claims
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Login to View More IPC IPC(8): G02B27/10G02B1/00
CPCG02B27/10G02B1/002
Inventor 伍铁生刘智慧伍代银杨丹杨祖宁刘岩钟旭刘锐
Owner GUILIN UNIV OF ELECTRONIC TECH