1 苏州大学物理科学与技术学院，江苏 苏州 215006
2 苏州城市学院光学与电子信息学院，江苏 苏州 215104
古斯-汉欣位移是二维或更高维体系中反射光中心产生的侧向位移。通过Mie理论，利用纳米金属球颗粒Drude模型，研究了线偏振光入射条件下纳米球颗粒远场侧向位移的变化规律。通过推导古斯-汉欣位移的解析表达式，并借助简化模型，揭示了古斯-汉欣位移方向反转的内在机制。研究发现古斯-汉欣位移在法诺共振附近出现区别于其他波段的增强峰模式，此时电偶极子和电四极子发生耦合。该研究为基于古斯-汉欣位移原理开发超灵敏探测器提供了参考。
物理光学 古斯-汉欣位移 法诺共振 纳米颗粒 Drude模型 光学学报
2022, 42(21): 2126001
Author Affiliations
Abstract
1 School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore
2 Research Center of Applied Electromagnetics, School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
3 e-mail: llliu@ntu.edu.sg
4 School of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
5 e-mail: dlgao@suda.edu.cn
In this work, we present a multi-channel nonreciprocal waveguide, which is composed of a gyrotropic-bounded dielectric on the bottom and a plasmonic material on the top. The Lorentz reciprocity in the time-invariant system is broken when applying an external static magnetic field on the gyrotropic material. The nonreciprocal emission from the dipole source located in the center of the waveguide is observed in extended waveband channels. The proposed heterostructure serves as a photonic dichroism once the dielectric is replaced by a nonlinear material. The associated second harmonic generated in the nonlinear process can be separated from the fundamental signal under proper magnetic field intensity. Our findings may provide significant guidance for designing nonreciprocal photonic devices with superiorities of a tunable waveband, multiple channels, and small footprint.
Photonics Research
2019, 7(6): 06000642
