Yan Bing, Ling Xiulan, Li Renxian, Zhang Jianyong, Liu Chenhua
Shool of Information and Communication Engineering, North University of China, Taiyuan 030051, China.
School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China.
Micromachines (Basel). 2022 Mar 17;13(3):456. doi: 10.3390/mi13030456.
In the framework of the generalized Lorenz-Mie theory (GLMT), the optical force and torque on a graphene-coated gold nanosphere by a vector Bessel beam are investigated. The core of the particle is gold, whose dielectric function is given by the Drude-Sommerfeld model, and the coating is multilayer graphene with layer number , whose dielectric function is described by the Lorentz-Drude model. The axial optical force Fz and torque Tz are numerically analyzed, and the effects of the layer number , wavelength λ, and beam parameters (half-cone angle α0, polarization, and order ) are mainly discussed. Numerical results show that the optical force and torque peaks can be adjusted by increasing the thickness of the graphene coating, and can not be adjusted by changing α0 and . However, α0 and can change the magnitude of the optical force and torque. The numerical results have potential applications involving the trapped graphene-coated gold nanosphere.
在广义洛伦兹 - 米氏理论（GLMT）框架下，研究了矢量贝塞尔光束作用于石墨烯包覆金纳米球上的光力和扭矩。粒子的核心是金，其介电函数由德鲁德 - 索末菲模型给出，涂层是层数为 的多层石墨烯，其介电函数由洛伦兹 - 德鲁德模型描述。对轴向光力Fz和扭矩Tz进行了数值分析，主要讨论了层数 、波长λ和光束参数（半锥角α0、偏振和阶数 ）的影响。数值结果表明，光力和扭矩峰值可通过增加石墨烯涂层厚度来调节，而不能通过改变α0和 来调节。然而，α0和 可改变光力和扭矩的大小。数值结果在捕获石墨烯包覆金纳米球方面具有潜在应用。
