Tunable nanoplasmonic sensor based on the asymmetric degree of Fano resonance in MDM waveguide

被引：81

作者：

Zhan, Shiping ^{[1
,2
]}

Peng, Yongyi ^{[1
]}

He, Zhihui ^{[1
]}

Li, Boxun ^{[1
]}

Chen, Zhiquan ^{[1
]}

Xu, Hui ^{[1
]}

Li, Hongjian ^{[1
]}

机构：

[1] Cent South Univ, Coll Phys & Elect, Changsha 410083, Hunan, Peoples R China

[2] Hunan Univ Sci & Technol, Coll Phys & Elect Sci, Xiangtan 411201, Peoples R China

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

PLASMON INDUCED TRANSPARENCY; SLOW-LIGHT;

D O I：

10.1038/srep22428

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We first report a simple nanoplasmonic sensor for both universal and slow-light sensing in a Fano resonance-based waveguide system. A theoretical model based on the coupling of resonant modes is provided for the inside physics mechanism, which is supported by the numerical FDTD results. The revealed evolution of the sensing property shows that the Fano asymmetric factor p plays an important role in adjusting the FOM of sensor, and a maximum of similar to 4800 is obtained when p = 1. Finally, the slow-light sensing in such nanoplasmonic sensor is also investigated. It is found that the contradiction between the sensing width with slow-light (SWS) and the relevant sensitivity can be resolved by tuning the Fano asymmetric factor p and the quality factor of the superradiant mode. The presented theoretical model and the pronounced features of this simple nanoplasmonic sensor, such as the tunable sensing and convenient integration, have significant applications in integrated plasmonic devices.

引用

页数：8

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