A tunable electromagnetic metagrating

A tunable electromagnetic metagrating
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可调谐电磁元光栅

DOI:
10.1098/rspa.2022.0454
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发表时间:
2022
期刊:
Mathematical, Physical and Engineering Sciences
影响因子:
--
通讯作者:
Putley H
Putley H
中科院分区:
--
文献类型:
--
作者:
Putley H

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我们探索电磁(EM)波入射到可重构超材料圆柱体的光栅上,这些圆柱体共同充当超光栅,以确定它们作为可重构亚波长表面的潜力。超圆柱由紧密间隔的微结构薄板阵列创建,在板间间距较小的限制下,由半解析连续介质模型描述。我们以水波中的元圆柱分析为基础,将其转化为 TE 极化(纵向磁场)的电磁场,其中元圆柱表现出各向异性散射;这被用于通过均匀圆柱半径和角度的无限元光栅进行光的多重散射,为此我们检索平面波入射的远场反射和透射光谱。这些光谱揭示了不寻常的效应,包括完美反射和透射场中的负古斯-汉欣位移,以及远场散射系数的完美对称性。元光栅还承载瑞利-布洛赫表面波,其色散取决于均匀的柱面角,当柱面角接近水平时,在旋转下向光线方向移动。对于平面波散射和阵列引导模式的计算,柱面角度是确定波相互作用的主要变量,并且简单地通过组成元柱面的旋转即可调谐元光栅。
We explore electromagnetic (EM) wave incidence upon gratings of reconfigurable metamaterial cylinders, which collectively act as a metagrating, to identify their potential as reconfigurable subwavelength surfaces. The metacylinders are created by a closely spaced, microstructured array of thin plates that, in the limit of small inter-plate spacing, are described by a semi-analytical continuum model. We build upon metacylinder analysis in water waves, translating this to EM for TE polarization (longitudinal magnetic field) for which the metacylinders exhibit anisotropic scattering; this is exploited for the multiple scattering of light by an infinite metagrating of uniform cylinder radius and angle, for which we retrieve the far-field reflection and transmission spectra for plane-wave incidence. These spectra reveal unusual effects including perfect reflection and a negative Goos–Hänchen shift in the transmitted field, as well as perfect symmetry in the far-field scattering coefficients. The metagrating also hosts Rayleigh–Bloch surface waves, whose dispersion is contingent on the uniform cylinder angle, shifting under rotation towards the light-line as the cylinder angle approaches the horizontal. For both plane-wave scattering and the calculation of the array-guided modes, the cylinder angle is the principal variable in determining the wave interaction, and the metagrating is tunable simply through rotation of the constituent metacylinders.
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