Plasmon-Enhanced Metasurfaces for Controlling Optical Polarization
Plasmon-Enhanced Metasurfaces for Controlling Optical Polarization
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DOI：
10.1021/ph5000192
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发表时间：
2014-06-01
期刊：
影响因子：
7
通讯作者：
Furlani, Edward P.
中科院分区：
文献类型：
--
作者：
Alali, Fatema;Kim, Young Hwa;Furlani, Edward P.
提出了一种利用嵌入非手性等离子体纳米结构的平面手性电介质超分子阵列形成的超表面来控制光偏振的方法。在等离子体共振中，亚波长等离子体纳米包裹体诱导周围介质的极化增强，从而在透射场中引起极化方位角的旋转。利用全波电磁分析研究了各种介质的光学响应与超分子的对称性和间距的关系。分析表明，该超分子可以定制控制光的偏振状态，在可见光到近红外光谱中产生偏振方位角超过10(5)度/mm的频率选择性巨旋，且损耗相对较低。所提出的方法为开发多功能超薄介质开辟了机会，这种超薄介质可以在新型微光学应用中操纵光偏振。
A method is proposed for controlling optical polarization using metasurfaces formed from arrays of planar chiral-patterned dielectric metamolecules with embedded achiral plasmonic nanostructures. At plasmon resonance, the subwavelength plasmonic nanoinclusions induce enhanced polarization of the surrounding dielectric, which gives rise to rotation of the polarization azimuth in the transmitted field. Full-wave electromagnetic analysis is used to investigate the optical response of various proposed media as a function of the symmetry and spacing of the metamolecules. The analysis shows that the metamolecules can be tailored to control the polarization state of light and produce frequency selective giant rotation of the polarization azimuth exceeding 10(5) deg/mm in the visible to near-infrared spectrum with relatively low loss. The proposed method opens up opportunities for the development of versatile ultrathin media that can manipulate optical polarization for novel micro-optical applications.