量子光学学报, 2019, 25 (3): 336, 网络出版: 2019-09-27  

基于同心纳米圆环谐振腔的MIM波导的PIA特性研究

Study on PIA-like Characteristics of MIM Waveguide Based on Concentric Nano Ring Resonator
作者单位
1 山西大学 物理电子工程学院,山西 太原 030006
2 山西大学 现代教育技术学院计算机中心,山西 太原 030006
摘要
本文设计了一种基于同心纳米圆环谐振腔的金属-介质-金属(MIM)表面等离子体光波导(SPW), 其中外侧是一个完整的环形谐振腔, 而内侧环形谐振腔带有一个微小缺口。利用数值和解析方法分析了不同几何参数下的传输特性。可以发现, 当缺口宽度θ=5°, 位置φ=45°时, 会在波长674 nm处产生明显的等离子体诱导吸收(Plasmonic Induced Absorption, PIA)现象。基于此, 首先研究了该结构在折射率传感器方面的应用, 研究结果表明, 其灵敏度超过600 nm/RIU, 最大品质因子约为700。其次研究了其快光和慢光特性, 在PIA传输谷处会产生约-0.081 ps的光学延迟, 意味着较大的异常色散和快光效应, 而在PIA传输谷两侧的传输峰处会分别产生约为0.045 ps和0.043 ps的光学延迟, 意味着较大的正常色散和慢光效应。这种表面等离子体光波导结构在折射率传感器、纳米滤波器、光开关和片上纳米光学器件集成等领域有一定的应用前景。
Abstract
In this paper,a metal-insulator-metal (MIM) surface plasmonic waveguide(SPW) structure based on concentric nanoring resonators is designed,of which the outer resonator is a perfect ring,and the inner one has a narrow slit.The numerical and analytical methods are used to investigate thetransmission characteristics under different structural parameters.It is found that when the split width is θ=5° and its rotation angle is φ=45°,a clear plasmonic induced absorption (PIA) effect is emerged at the wavelength of 674 nm.Based on this result,the application of the proposed waveguide structure in the area of refractive index sensor is studied at first.The result shows that the sensitivity is larger than 600 nm/RIU,and its maximum figure of merit (FOM) is about 700.Second,the characteristics of fast-and slow-light effects are studied,and it is shown that optical delay time of about -0.081 ps is occurred at the PIA transmission dip,which means the larger abnormal dispersion and fast-light effect.While optical delay time of about 0.045 ps and 0.043 ps occur at the two transmission peaks on both sides of the PIA dip,which means the larger normal dispersion and slow-light effect.This surface plasmonic optical waveguide structure has potential application prospects in the fields of nano refractive index sensors,nano filters,nano all-optical switches,and on-chip integrating of nano optical devices.

李杰瑾, 田晋平, 杨荣草. 基于同心纳米圆环谐振腔的MIM波导的PIA特性研究[J]. 量子光学学报, 2019, 25(3): 336. LI Jie-jin, TIAN Jin-ping, YANG Rong-cao. Study on PIA-like Characteristics of MIM Waveguide Based on Concentric Nano Ring Resonator[J]. Acta Sinica Quantum Optica, 2019, 25(3): 336.

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