Switchable Chiroptical Hot-Spots in Silicon Nanodisk Dimers
Switchable Chiroptical Hot-Spots in Silicon Nanodisk Dimers
复制标题
DOI：
10.1021/acsphotonics.9b00388
复制
发表时间：
2019-07
期刊：
影响因子：
7
通讯作者：
Xin Zhao;Bjoern M. Reinhard
中科院分区：
文献类型：
--
作者：
Xin Zhao;Bjoern M. Reinhard
我们通过实验光谱和电磁模拟相结合，证明了线性光偏振下硅（Si）纳米盘二聚体的均匀符号光学手性产生。在单个Si纳米盘中的磁偶极共振的激发产生增强的电场和磁场。我们表明，由相邻的硅纳米盘提供的磁场激发线偏振光在磁偶极共振可以对齐，产生强的近场手性的Si纳米盘之间的差距。硅纳米盘二聚体的近场手性增强相比，共振金（Au）纳米粒子二聚体，提供几乎完全电场增强。我们实验确定的第三个斯托克斯参数，S3，通过硅纳米盘二聚体蓝宝石上制造的作为衡量的手征通量和相关的近场手征传输的光。实验证实了在硅纳米晶中产生了均匀符号的光学手征。
We demonstrate uniform sign optical chirality generation in dimers of silicon (Si) nanodisks under linear light polarization through combination of experimental spectroscopy and electromagnetic simulations. Excitation of the magnetic dipole resonance in individual Si nanodisks generates enhanced electric and magnetic fields. We show that the fields provided by adjacent Si nanodisks excited with linearly polarized light at the magnetic dipole resonance can align to generate strong near-field chirality in the gap between the Si nanodisks. The near-field chirality enhancement for Si nanodisk dimers is compared with that for resonant gold (Au) nanoparticle dimers that provide almost exclusively electric field enhancement. We experimentally determine the third Stokes parameter, S3, of light transmitted through Si nanodisk dimers fabricated on sapphire as a measure for the chirality flux and the related near-field chirality. The experiments confirm the generation of uniform sign optical chirality in the Si nano...