Exploiting the uniquely tunable optical response and the strong optical Kerr nonlinearity of a graphene sheet conjugated by the propagating leaky surface plasmons (SPs) excited on top of gold (Au) stripes, an efficient and high-speed electrically reconfigurable plasmonic tweezer is presented. It is demonstrated that using a number of electrically and optically isolated Au stripes and topped graphene, metallic, and dielectric nanoparticles (NPs) can be trapped, sensed, guided, and sorted in a controllable manner. Also, numerical simulations show that at high enough SP fields, the fundamental SP mode is laterally self-focused by an induced laterally graded refractive index and consequently experiences weaker edge effects. It is shown that a more confined and enhanced SP mode in the nonlinear regime is beneficial to trapping and sensing applications. The proposed stacked structure of a nonpatterned graphene sheet and Au stripes offers an efficient and powerful method for developing reconfigurable plasmofluidic channels in controlling the trajectory of label-free NPs.

中文翻译：

---

高速电可重构胞浆流体通道的数值研究

利用在金（Au）条纹顶部激发的传播泄漏表面等离子体激元（SP）共轭的石墨烯片的独特可调谐光学响应和强光学克尔非线性，提出了一种高效且高速的电可重构等离子体激元钳。已证明，使用许多电隔离和光隔离的Au条带和顶部的石墨烯，金属和电介质纳米颗粒（NPs）可以以可控的方式捕获，感测，引导和分类。此外，数值模拟表明，在足够高的SP场下，基本SP模式在横向上是自聚焦的由诱导的横向渐变折射率导致的边缘效应较弱。结果表明，在非线性状态下更局限和增强的SP模式有利于捕获和传感应用。提出的非图案化石墨烯片和Au条带的堆叠结构为控制可重构无标记NP的轨迹提供了开发可重构质液流通道的有效方法。