人工局域表面等离子体中环偶极子耦合效应研究

Study on the coupling characteristics of ring dipole in artificial localized surface plasmons

为了研究微波频率下人工局域表面等离子体中环偶极子的激励和耦合效应,设计了双层紧凑型金属圆盘结构。该金属圆盘结构由双层单裂谐振环阵列及介质板组成。采用微波激发该结构上层环偶极子模式,再利用介质板耦合到下层环偶极子,实现环偶极子级联耦合。通过调整上下谐振环的阵列数量,谐振口的大小以及中间介质板的介电系数的变化,获得双层阵列的上下环偶极子模式的耦合结果。研究结果表明,该模式可以产生多峰环偶极子效应,丰富了对人工局域表面等离子体中环偶极子模式间耦合效应的认识,可为新型传感器的设计和应用提供参考。

In order to investigate the coupling effect of the two-layer array and the resulting upper and lower ring dipole modes,a microwave method was used to introduce a split resonant ring array structure in which the intermediate separator and the upper and lower surface were placed.Firstly,the upper ring dipole mode of the structure is excited by microwave,and then the dielectric plate is coupled to the lower ring dipole to realize the ring dipole cascade coupling,by adjusting the resonant ring up and down the number of array,the size of the resonant mouth,as well as the change of the medium plate in the middle of the dielectric coefficient.The excitation and coupling effects of ring dipoles in artificial localized surface plasmas by microwave frequencies can be studied.The results show that this mode can produce multi-peak ring dipole effect,which enriches the understanding of the coupling effect between artificial local surface plasmon ring dipole modes,and lays a foundation for the design and application of new sensors.