表面等离子波导系统中基于远场耦合的可控单向无反射  

Controllable unidirectional reflectionlessness in a surface plasmonic waveguide system based on far-field coupling

作　　者：何志伟 金星日 HE Zhiwei;JIN Xingri(College of Science,Yanbian University,Yanji 133002,China)

机构地区：[1]延边大学理学院,吉林延吉133002

出　　处：《延边大学学报（自然科学版）》2022年第1期48-54,共7页Journal of Yanbian University（Natural Science Edition）

基　　金：国家自然科学基金(11864043,12064045)。

摘　　要：设计了一个由两个共振器与一个表面等离子波导边耦合的系统,并通过施加外部电压研究了该系统的单向无反射现象.研究结果表明:当外部电压U=2.75V(9.47V)时,正向反射率接近0(0.58),反向反射率接近0.71(0);该系统可以在较宽的电压范围、共振器的间距范围、共振器A与表面等离子波导的间隙范围和共振器B的长度范围内实现单向无反射现象.该研究结果可为研发光二极管、电光开关、滤波器、传感器等元件提供理论参考.By using the system composed of two resonators side-coupled to a surface plasmonic waveguide,we studied the controllable unidirectional reflectionlessness by applying external voltage.The results show that the reflections for forward and backward directions are close to 0(0.58)and 0.71(0),respectively,when the external voltage is U=2.75V(9.47V).Furthermore,the unidirectional reflectionlessness in our system can be realized in the wider range of the external voltage,the distance between two resonators,the gap between the plasmonic waveguide and resonator A,and the length of resonator B.The research results can provide theoretical supports for the development of photodiode,electro-optic switch,filter,sensor and other components.

关 键 词：单向无反射 表面等离子激元 表面等离子波导 异常点 

分 类 号：O431[机械工程—光学工程]