含有凹口的金属纳米环形共振器的本征模式分裂  

Splitting of transmission modes in a nanoscale metal ring resonator with a notch

作　　者：王同标[1] 刘念华[2] 于天宝[1] 徐旭明[1] 廖清华[1] 

机构地区：[1]南昌大学物理系,南昌330031 [2]南昌大学高等研究院,南昌330031

出　　处：《物理学报》2014年第1期307-312,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11264029;11264030);江西省自然科学基金(批准号:20114BAB212005);江西省教育厅基金(批准号:GJJ12139)资助的课题~~

摘　　要：提出了一种含有凹口金属纳米环形共振器结构,采用时域有限差分方法模拟了表面等离子体在这种结构中的传播特性.详细研究了凹口的长度、位置以及环的半径对透射性质的影响,发现当凹口的长度满足一定条件,并且处于某些特定位置的时候,与没有凹口的环形共振器相比,本征透射模式会发生分裂.随着环半径的增加,透射模式会向长波长方向移动,但不会对模式的分裂造成影响.A nanoscale metal ring resonator with a notch is proposed,in which the propagating characteristics of surface plasmons was studied with the help of fnite-diference time-domain method.Infuences of the length and position of the notch and the radius of the ring on the transmission properties of the ring resonator have been studied in detail.We found that,compared with the ring resonator without notch,the intrinsic mode of the ring resonator will split when the length and position of the notch satisfy some special conditions.In addition,the split modes will shift toward longer wavelengths as the radius of the ring increases,while the variation of the radius has no infuence on the splitting behavior of the intrinsic modes.

关 键 词：表面等离子体 环形共振器 

分 类 号：O53[理学—等离子体物理]