Broadband convolutional scattering characteristics of all dielectric transmission Pancharatnam–Berrygeometric phase metasurfaces

IF 0.7 4区 物理与天体物理 Q4 OPTICS Optica Applicata Pub Date : 2022-01-01 DOI:10.37190/oa220211
Yiyun Li, Yongxing Jin, Xufeng Jing, Lijiang Shi, Chenxia Li, Zhi Hong
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Abstract

In order to obtain the broadband scattering characteristics, we propose a superperiodic cell structure with all-dielectric material to construct Pancharatnam–Berry geometric phase encoding metasurfaces. Because we cannot design or prepare infinitesimal coding unit particles, according to the generalized Snell’s law, we can only obtain discrete scattering angle regulation for the basic coding metasurface sequence. In order to obtain multi-angle scattering characteristics, we introduce the Fourier convolution principle in digital signal processing on the Pancharatnam–Berry geometric phase encoding metasurfaces. By using the addition and subtraction operations on two encoding metasurface sequences, a new encoding metasurface sequence can be obtained with different deflection angle. Fourier convolution operations on the encoding metasurfaces can provide an efficient method in optimizing encoding patterns to achieve continuous scattering beams. The addition and subtraction methods are also applicable to the checkerboard coding mode. The combination of Fourier convolution principle and Pancharatnam–Berry phase coded metasurface in digital signal processing can realize more powerful electromagnetic wave manipulation capability.
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全介质传输pancharatnam - berry几何相位超表面的宽带卷积散射特性
为了获得宽带散射特性,我们提出了一种全介质材料的超周期单元结构来构造Pancharatnam-Berry几何相位编码超表面。由于我们无法设计或制备出无穷小的编码单元粒子,根据广义Snell定律,我们只能得到基本编码超表面序列的离散散射角规律。为了获得多角度散射特性,将傅里叶卷积原理引入到Pancharatnam-Berry几何相位编码超表面的数字信号处理中。通过对两个编码超表面序列进行加减运算,可以得到具有不同偏转角度的新编码超表面序列。在编码元表面上进行傅里叶卷积运算可以为优化编码模式以实现连续散射光束提供一种有效的方法。加减法也适用于棋盘格编码模式。在数字信号处理中,将傅里叶卷积原理与Pancharatnam-Berry相位编码超表面相结合,可以实现更强大的电磁波操纵能力。
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来源期刊
Optica Applicata
Optica Applicata 物理-光学
CiteScore
1.00
自引率
16.70%
发文量
21
审稿时长
4 months
期刊介绍: Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.
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