Controlling Metamaterial Transparency with Superchiral Fields
Controlling Metamaterial Transparency with Superchiral Fields
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DOI：
10.1021/acsphotonics.7b01071
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发表时间：
2018-02-01
期刊：
影响因子：
7
通讯作者：
Kadodwala, Malcolm
中科院分区：
文献类型：
--
作者：
Kelly, Christopher;Khorashad, Larousse Khosravi;Kadodwala, Malcolm
超材料的出现预示着一个前所未有的光控制时代。超材料的光学响应由组成纳米结构的特性决定。当前定制超材料功能的设计理念是使用几何形状来控制纳米结构元素的近场耦合。这种以几何为中心的策略的缺点是，超材料的功能是预先确定的，并且在制造后无法轻松操纵。在这里，我们提出了一种新的超材料设计范例，其中纳米结构的手性元素之间的耦合由近场的手性不对称性控制，可以从外部操纵。我们称这种机制为二向色耦合。这种现象用于通过调节近场的手性来控制手性超材料显示的电磁感应透明度。这种用于控制光学特性的“非几何”范式提供了优化设计手性超材料的机会，以用于偏振态控制以及生物材料和软物质的超灵敏分析。
The advent of metamaterials has heralded a period of unprecedented control of light. The optical responses of metamaterials are determined by the properties of constituent nanostructures. The current design philosophy for tailoring metamaterial functionality is to use geometry to control the nearfield coupling of the elements of the nanostructures. A drawback of this geometry-focused strategy is that the functionality of a metamaterial is predetermined and cannot be manipulated easily postfabrication. Here we present a new design paradigm for metamaterials, in which the coupling between chiral elements of a nanostructure is controlled by the chiral asymmetries of the nearfield, which can be externally manipulated. We call this mechanism dichroic coupling. This phenomenon is used to control the electromagnetic induced transparency displayed by a chiral metamaterial by tuning the chirality of the near fields. This "non geometric" paradigm for controlling optical properties offers the opportunity to optimally design chiral metamaterials for applications in the polarization state control and for ultrasensitive analysis of biomaterials and soft matter.