[18p-231C-1~19] 3.1 Basic optics and frontier of optics

▼ [18p-231C-8] Surface Plasmon Enhanced Optical Torque between Twisted Nanorods

〇Anan Wu¹, Yoshito Tanaka^1,2, Ryoma Fukuhara¹, Tsutomu Shimura¹ (1.IIS, The Univ. of Tokyo, 2.JST PRESTO)

Keywords:optical torque, plasmon coupling

Plasmon coupling between two metal nanoparticles depends on their interparticle separation and enhances the electromagnetic (EM) field in the nanogap, resulting in the enhancement of their interaction optical force. In general, optical force is induced by the linear momentum transfer between light and matter. Meanwhile, the light-matter interaction also can produce optical torque due to the transfer of angular momentum. Here, we have studied, for the first time, an interaction optical torque between twisted metal nanorods using electromagnetic simulation and revealed that the optical torque can be strongly enhance by plasmon coupling.