Theoretical analysis of ultrahigh figure of merit sensing in plasmonic waveguides with a multimode stub

Abstract

We propose an expanded coupled mode theory to analyze sensing performance in a plasmonic slot waveguide side-coupled with a multimode stub resonator. It is confirmed by the finite-difference time-domain simulations. Through adjusting the parameters, we can realize figure of merit (FOM) of $\sim \mathrm{59,010}$, and the sensitivity $S$ can reach to 75.7. Compared with the plasmonic waveguide systems in recent Letters, our proposed structure has the advantages of easy fabrication, compactness, sensitivity, and high FOM. The proposed theory model and findings provide guidance for fundamental research of the integrated plasmonic nanosensor applications.

© 2016 Optical Society of America

Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system

Xiaobin Ren, Kun Ren, and Yuanxue Cai
Appl. Opt. 56(31) H1-H9 (2017)

Slow-light enhanced subwavelength plasmonic waveguide refractive index sensors

Yin Huang, Changjun Min, Pouya Dastmalchi, and Georgios Veronis
Opt. Express 23(11) 14922-14936 (2015)

Plasmon-induced transparency in a single multimode stub resonator

Guangtao Cao, Hongjian Li, Yan Deng, Shiping Zhan, Zhihui He, and Boxun Li
Opt. Express 22(21) 25215-25223 (2014)

Formation and evolution mechanisms of plasmon-induced transparency in MDM waveguide with two stub resonators

Guangtao Cao, Hongjian Li, Shiping Zhan, Haiqing Xu, Zhimin Liu, Zhihui He, and Yun Wang
Opt. Express 21(8) 9198-9205 (2013)

Guidelines for designing 2D and 3D plasmonic stub resonators

Solmaz Naghizadeh and Şükrü Ekin Kocabaş
J. Opt. Soc. Am. B 34(1) 207-217 (2017)