Symmetry Reduction and Shape Effects in Concave Chiral Plasmonic Structures

Symmetry Reduction and Shape Effects in Concave Chiral Plasmonic Structures
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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:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Paterson G
Paterson G
中科院分区:
--
文献类型:
--
作者:
Paterson G

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手征超材料由于其产生的手征近场与光和物质的相互作用而表现出许多有趣的性质。我们调查的手性金“gammadion”的等离子体性质的结构缺陷的影响,使用电子能量损失谱直接通知模拟现实的,不完美的结构。与简单的凸形几何结构不同,理想的凹型gammadion的最低能量模式具有四极和偶极特性,模式能量由gammadion臂之间的静电耦合的性质决定。这些模式受到材料特性和光刻图案化所固有的结构缺陷的强烈影响。即使亚波长尺度的缺陷降低对称性,升降机模式简并转换暗模式到明亮的,并显着改变模式的能量,其近场强度,和手征。这种效应将是共同的一些多尖端凹结构目前正在研究的手征领域,他们支持。
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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