Theoretical investigation of a plasmonic sensor based on a metal–insulator–metal waveguide with a side-coupled nanodisk resonator

Yiyuan Xie; Yexiong Huang; Hongjun Che; Weilun Zhao; Weihua Xu; Xin Li; Jiachao Li

doi:10.1117/1.JNP.9.093099

13 January 2015 Theoretical investigation of a plasmonic sensor based on a metal–insulator–metal waveguide with a side-coupled nanodisk resonator

Yiyuan Xie, Yexiong Huang, Hongjun Che, Weilun Zhao, Weihua Xu, Xin Li, Jiachao Li

Author Affiliations +

Funded by: National Natural Science Foundation of China, Natural Science Foundation of China, Natural Science Foundation of Chongqing Municipal, Fundamental Research Funds for the Central Universities

Journal of Nanophotonics, Vol. 9, Issue 1, 093099 (January 2015). https://doi.org/10.1117/1.JNP.9.093099

Abstract

A plasmonic sensor based on a metal–insulator–metal waveguide with a side-coupled nanodisk resonator is proposed and numerically investigated using a ﬁnite-difference time-domain method. The numerical simulation results indicate that more than one sharp resonance dip appears in the transmission spectrum in the telecommunication regime, and each resonance wavelength has a linear relationship with the refractive index of the dielectric in the resonator. In addition, the sensing characteristics of the structure and the influence of its structural parameters are analyzed in detail by investigating the transmission spectra. As a refractive-index sensor, its sensitivity can reach as high as 1150 nm per refractive index unit near the resonance wavelength of 1550 nm, and its sensing resolution can reach 10−⁶ for a wavelength resolution of 0.01 nm. Furthermore, by employing the relationship between the temperature and the refractive index, the temperature-sensing characteristics of the structure are also discussed. Near the resonance wavelength of 1550 nm, the temperature sensitivity can reach 0.45 nm/°C. The sensor has a compact and simple structure and may find many potential and important applications in optical networks-on-chip and on-chip nanosensors.

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Yiyuan Xie, Yexiong Huang, Hongjun Che, Weilun Zhao, Weihua Xu, Xin Li, and Jiachao Li "Theoretical investigation of a plasmonic sensor based on a metal–insulator–metal waveguide with a side-coupled nanodisk resonator," Journal of Nanophotonics 9(1), 093099 (13 January 2015). https://doi.org/10.1117/1.JNP.9.093099

Published: 13 January 2015

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