摘要
为克服等离子体波导系统存在结构复杂、可利用波段范围小以及可调性差的缺点,提出了一种简单的双半环型腔金属-绝缘体-金属等离子激元波导结构(double semi-ring,DSR)。利用有限元法(finite element method,FEM)对其进行了模拟计算,并通过调整结构的几何参数和介质折射率,研究了该结构的透射特性和传感特性。结果发现:DSR结构能够产生2个典型的法诺共振,并且窄的离散态对法诺共振的形成起主导作用。改变共振腔的宽度和耦合距离可以实现对法诺共振的独立调控,该结构的最大折射率灵敏度和品质因数分别为1260 nm/RIU和17473 RIU^(-1)。通过在DSR结构的基础上添加共振腔可以实现四重法诺共振和法诺共振的半独立调控。提出的等离子激元波导结构简单且能产生透射率大、可调性好和灵敏感度高的多重法诺共振,可用于滤波器、光开关和传感器等领域。
The common plasma waveguide system can not be widely used due to its complex structure,limited available band and poor tunability.A simple metal-insulator-metal(MIM)waveguide composed of double semi-ring cavities(DSR)is proposed.The finite element method(FEM)is used to simulate the structure,and the transmittance and sensing characteristics are studied by adjusting geometric parameters and refractive index.It is shown that two typical Fano resonances can be produced,which can be regulated independently by cavity size and coupling distance.It can be found that discrete energy plays a leading role in the formation of Fano resonances,and the maximum refractive index sensitivity and figure of merit are 1260 nm/RIU and 17473 RIU^(-1) respectively.In addition,four Fano resonances and semi-independent control can be realized by adding resonance cavity to DSR structure.Due to the advantage of simple construction and the ability to generate multiple Fano resonances with high transmittance,good tunability and high sensitivity,the DSR can be used in the fields of filters,switches,sensors.
作者
郝祥祥
霍义萍
何倩
宋美娜
王蕴岩
崔鹏飞
HAO Xiangxiang;HUO Yiping;HE Qian;SONG Meina;WANG Yunyan;CUI Pengfei(School of Physics and Information Technology,Shaanxi Normal University,Xi′an 710119,Shaanxi,China;Xi′an Key Laboratory of Optical Information Manipulation and Augmentation,Xi′an 710119,Shaanxi,China)
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第1期12-20,共9页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金(11604198)。
