Tuning the Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide for sensing applications

被引：9

作者：

Wu, Tiesheng ^{[1
]}

Liu, Yumin ^{[1
,2
]}

Yu, Zhongyuan ^{[1
]}

Ye, Han ^{[1
]}

Shu, Changgan ^{[1
]}

Peng, Yiwei ^{[1
]}

Wang, Jie ^{[1
]}

He, Huifang ^{[1
]}

机构：

[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China

[2] Chinese Acad Sci, State Key Lab Integrated Optoelect, Inst Semicond, Beijing 100083, Peoples R China

来源：

MODERN PHYSICS LETTERS B | 2015年 / 29卷 / 33期

基金：

中国国家自然科学基金;

关键词：

Surface plasmons; optical sensing and sensors; optical resonators; integrated optics devices; SYMMETRY-BREAKING; ARRAYS; FILTER;

D O I：

10.1142/S0217984915502188

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A novel surface plasmon polaritons (SPPs) refractive index sensor based on a single defect nanocavity coupled with a metal-insulator-metal (MIM) waveguide is proposed and numerically simulated by using the finite difference time domain (FDTD) method with perfectly matched layer absorbing boundary condition. It is found that the defect structure can realize two Fano resonances and these two Fano resonances originate from two different mechanisms. The results demonstrate the liner correlation between the resonance wavelengths of the device and the refractive index of the material under sensing. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity as high as 1800.4 nmRIU-1. It could be utilized to develop ultra-compact nanodevice for high-resolution biological sensing.

引用

页数：10

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