Transverse optical torque induced by localized surface plasmons
Transverse optical torque induced by localized surface plasmons
复制标题
局域表面等离子体激元引起的横向光扭矩
DOI：
10.1103/physreva.100.023827
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and Tsutomu Shimura
中科院分区：
文献类型：
--
作者：
Ryoma Fukuhara;Yoshito Y. Tanaka;and Tsutomu Shimura
我们报道了局域表面等离子体共振允许单一元素纳米结构在与传播的平面波相互作用时诱导光的非本征角动量。角动量的反冲导致沿垂直于光轴的轴对结构产生光学扭矩，并且这种横向扭矩的特性取决于入射偏振态，包括自旋方向。我们的结果表明，所设计的暗等离激元模式可以为小于衍射极限的纳米粒子的光学操纵提供新的自由度。
We report that localized surface plasmon resonance allows a single-element nanostructure to induce an extrinsic angular momentum of light in its interaction with a propagating plane wave. The recoil of the angular momentum results in an optical torque on the structure along an axis perpendicular to the optical axis, and the characteristics of this transverse torque depend on the incident polarization state, including the spin direction. Our results suggest that the designed dark plasmon mode can provide a new degree of freedom for optical manipulation of nanoparticles smaller than the diffraction limit.