通过元表面实现无散射等离子布鲁斯特效应

Xinyan Zhang, Xingshuo Cui, Tong Cai, Weiqi Cai, Tony Low, Hongsheng Chen, Xiao Lin
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摘要

布儒斯特效应可追溯到 1815 年大卫-布儒斯特爵士的开创性工作,它提供了一条在光学界面上实现入射波和透射传播波之间 100% 能量转换的重要途径,对偏振滤波、光束转向和光学宽带角度选择等许多实际应用具有根本性的重要意义。然而,表面波的布儒斯特效应能否在不涉及负透过率或负渗透率材料的情况下实现,仍然是个未知数。这是因为在表面波的入射作用下,要完全抑制传播波的寄生散射和表面波的反射是一项艰巨的挑战。在这里,我们揭示了通过各向同性超表面实现无散射等离子布鲁斯特效应的可行途径,以及使用具有各向异性和磁响应的正容错性和正渗透性超材料。从本质上讲,超材料各向异性响应的合理设计可以完全抑制传播波的寄生散射,而超材料的磁响应则有利于完全抑制超表面支持的表面波的反射。此外,我们还发现这种通过超表面产生的等离子布鲁斯特效应可以进一步设计为在任意入射角度下发生,从而产生了全角无散射等离子布鲁斯特效应这一奇特现象。
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Scattering-free plasmonic Brewster effect via metasurfaces
The Brewster effect, dating back to the pioneering work of Sir David Brewster in 1815, offers a crucial route to achieve 100% energy conversion between the incident and transmitted propagating waves at an optical interface and is of fundamental importance to many practical applications, such as polarization filtering, beam steering, and optical broadband angular selectivity. However, whether the Brewster effect of surface waves can be implemented without the involvement of negative-permittivity or negative-permeability materials remains elusive. This is due to the formidable challenge to fully suppress both the parasitic scattering into propagating waves and the reflection into surface waves under the incidence of surface waves. Here, we reveal a feasible route to achieve scattering-free plasmonic Brewster effect via isotropic metasurfaces, along with the usage of positive-permittivity and positive-permeability metamaterials with both anisotropic and magnetic responses. In essence, the anisotropic response of metamaterials is judiciously designed to fully suppress the parasitic scattering into propagating waves, while the magnetic response of metamaterials facilitates the full suppression of the reflection into surface waves supported by metasurfaces. Moreover, we find that this plasmonic Brewster effect via metasurfaces can be further engineered to occur for arbitrary incident angles, giving rise to the exotic phenomenon of all-angle scattering-free plasmonic Brewster effect.
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