论文标题
Terahertz复合等离子板基于双层金属光栅
Terahertz composite plasmonic slabs based on double-layer metallic gratings
论文作者
论文摘要
在Terahertz（THZ）区域在实验和数值上证明了基于双层金属光栅和介电膜的复合等离子体平板，可以支持两种共振模式，然后形成宽带的带隙（40％）。与双层金属光栅相比，复合THZ平板中的介电膜显着增强了横向磁（TM）模式的传输。电场矢量证明，低频共振模式源自对称等离子体模式，高频共振模式是由等离激元和介电模式的混合模式诱导的。通过更改结构参数，已经分析了金属光栅和介电膜之间固有的近场耦合。我们进一步证明，通过调整金属光栅宽度，可以操纵等离子带隙。这些结果表明，该复合等离子体板在THZ区域具有很大的用作滤波器，偏振器和传感器的潜力。
A composite plasmonic slab based on double-layer metallic gratings and a dielectric film is experimentally and numerically demonstrated in terahertz (THz) regions, which can support two resonance modes and then form a broad bandgap (40%). As compared to the double-layer metal grating, the dielectric film in composite THz slabs significantly enhances the transmission of the transverse magnetic (TM) mode. Electric field vector proved that the low-frequency resonance mode originates from the symmetric plasmonic mode and the high-frequency resonance mode is induced by the hybrid mode of plasmonic and dielectric modes. The inherently near field coupling between metal gratings and dielectric film has been analyzed by changing the structural parameters. We further demonstrate that by tuning the metallic grating width, the plasmonic bandgap can be manipulated. These results suggest that this composite plasmonic slab has great potential for use as a filter, polarizer, and sensor in THz regions.
