Tunable Chiral Optics in All-Solid-Phase Reconfigurable Dielectric Nanostructures.

Tunable Chiral Optics in All-Solid-Phase Reconfigurable Dielectric Nanostructures.
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可调的手性光学元件中的全相可重构介电纳米结构。

DOI:
10.1021/acs.nanolett.0c03957
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发表时间:
2021-01-27
期刊:
影响因子:
10.8
通讯作者:
Zheng Y
Zheng Y
中科院分区:
材料科学1区
文献类型:
--
作者:
Li J;Wang M;Wu Z;Li H;Hu G;Jiang T;Guo J;Liu Y;Yao K;Chen Z;Fang J;Fan D;Korgel BA;Alù A;Zheng Y

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具有可调成分和几何形状的亚波长纳米结构显示出用于实现纳米光子系统的有利光学功能。对固体衬底上的结构配置进行精确和通用的控制对于其在片上器件中的应用至关重要。在这里,我们报告全固相可重构手性纳米结构与硅纳米粒子和纳米线作为积木,其中的配置和手性响应可以定制的需求,通过动态操纵的硅纳米粒子。通过数值模拟和耦合模理论分析,揭示了纳米硅颗粒和纳米硅线的光学共振之间的旋向性依赖耦合是其光学手性的来源。此外,共存的电和磁共振支持光学近场手性的强烈增强,这使得在单个纳米结构中的生物分子的无标记的对映体歧视。我们的研究结果不仅为功能性高折射率材料的设计提供了见解,而且为开发光子和电子应用的自适应器件带来了新的策略。
Subwavelength nanostructures with tunable compositions and geometries show favorable optical functionalities for the implementation of nanophotonic systems. Precise and versatile control of structural configurations on solid substrates is essential for their applications in on-chip devices. Here, we report all-solid-phase reconfigurable chiral nanostructures with silicon nanoparticles and nanowires as the building blocks in which the configuration and chiroptical response can be tailored on-demand by dynamic manipulation of the silicon nanoparticle. We reveal that the optical chirality originates from the handedness-dependent coupling between optical resonances of the silicon nanoparticle and the silicon nanowire via numerical simulations and coupled-mode theory analysis. Furthermore, the coexisting electric and magnetic resonances support strong enhancement of optical near-field chirality, which enables label-free enantiodiscrimination of biomolecules in single nanostructures. Our results not only provide insight into the design of functional high-index materials but also bring new strategies to develop adaptive devices for photonic and electronic applications.
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