Ultrafast manipulation of near field coupling between bright and dark modes in terahertz metamaterial
Ultrafast manipulation of near field coupling between bright and dark modes in terahertz metamaterial
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DOI：
10.1063/1.4774003
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发表时间：
2013-01-07
影响因子：
4
通讯作者：
Azad, Abul K.
中科院分区：
文献类型：
--
作者：
Chowdhury, Dibakar Roy;Singh, Ranjan;Azad, Abul K.
我们展示了超材料中亮模式和暗模式共振之间的近场耦合的超快光学控制。元分子设计由两个通过近场紧密耦合的正交扭曲谐振器组成。我们将具有超快载流子寿命的离子注入硅片放置在暗谐振器裂隙内，以实现对其基本谐振的主动控制，从而确定元分子中的近场耦合。在近红外光激发时，我们观察到明谐振器和暗谐振器之间近场耦合的超快动态转变，使超分子将其状态从耦合状态改变为解耦合状态，并最终回到耦合状态。 (C) 2013 年美国物理研究所。 [http://dx.doi.org/10.1063/1.4774003]
We demonstrate ultrafast optical control of near field coupling between bright and dark mode resonances in metamaterials. The meta-molecule design consists of two orthogonally twisted resonators tightly coupled through near fields. We place ion implanted silicon patch with ultrafast carrier lifetime inside dark resonator split gap to achieve active control of its fundamental resonance that determines the near field coupling in the meta-molecule. Upon near infrared photoexcitation, we observed ultrafast dynamical transition of near field coupling between bright and dark resonators allowing the meta-molecule to change its state from coupled to decoupled and eventually back to the coupled state. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4774003]