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Controlling Metamaterial Transparency with Superchiral Fields
ACS Photonics ( IF 7 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1021/acsphotonics.7b01071
Christopher Kelly 1 , Larousse Khosravi Khorashad 2 , Nikolaj Gadegaard 3 , Laurence D. Barron 1 , Alexander O. Govorov 2 , Affar S. Karimullah 1, 3 , Malcolm Kadodwala 1
Affiliation  

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.

中文翻译:

用超手性场控制超材料的透明度

超材料的出现预示了对光的空前控制的时期。超材料的光学响应由组成纳米结构的特性决定。定制超材料功能的当前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。这种以几何学为中心的策略的缺点是,超材料的功能是预先确定的,并且在制造后不易操作。在这里,我们提出了一种超材料的新设计范式,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控制,该不对称性可以在外部进行操纵。我们称这种机制为二向色性耦合。通过调整近场的手征性,此现象可用于控制由手征性超材料显示的电磁感应透明性。这种用于控制光学性质的“非几何”范式为优化设计手性超材料提供了机会,以用于偏振态控制以及生物材料和软物质的超灵敏分析。
更新日期:2017-11-21
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