Symmetry Reduction and Shape Effects in Concave Chiral Plasmonic Structures
Symmetry Reduction and Shape Effects in Concave Chiral Plasmonic Structures
复制标题
凹手性等离子体结构中的对称性降低和形状效应
DOI:
10.1021/acs.jpcc.7b12260
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Paterson G
中科院分区:
文献类型:
--
作者:
Paterson G
Chiral metamaterials have shown a number of interesting properties which result from the interaction of the chiral near-field they produce with light and matter. We investigate the influence of structural imperfections on the plasmonic properties of a chiral gold “gammadion”, using electron energy loss spectroscopy to directly inform simulations of realistic, imperfect structures. Unlike structures of simple convex geometry, the lowest energy modes of the ideal concave gammadion have a quadrupole and dipole character, with the mode energies determined by the nature of electrostatic coupling between the gammadion arms. These modes are strongly affected by structural imperfections that are inherent to the material properties and lithographic patterning. Even subwavelength-scale imperfections reduce the symmetry, lift mode degeneracies convert dark modes into bright ones and significantly alter the mode energy, its near-field strength, and chirality. Such effects will be common to a number of multitipped concave structures currently being investigated for the chiral fields they support.
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