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Sensors 2016, 16(5), 706; doi:10.3390/s16050706

A Plasmonic Temperature-Sensing Structure Based on Dual Laterally Side-Coupled Hexagonal Cavities

School of Electronic and Information Engineering, Southwest University, Chongqing 400715, China
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Author to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 17 March 2016 / Revised: 28 April 2016 / Accepted: 4 May 2016 / Published: 17 May 2016
(This article belongs to the Special Issue Resonator Sensors)
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Abstract

A plasmonic temperature-sensing structure, based on a metal-insulator-metal (MIM) waveguide with dual side-coupled hexagonal cavities, is proposed and numerically investigated by using the finite-difference time-domain (FDTD) method in this paper. The numerical simulation results show that a resonance dip appears in the transmission spectrum. Moreover, the full width of half maximum (FWHM) of the resonance dip can be narrowed down, and the extinction ratio can reach a maximum value by tuning the coupling distance between the waveguide and two cavities. Based on a linear relationship between the resonance dip and environment temperature, the temperature-sensing characteristics are discussed. The temperature sensitivity is influenced by the side length and the coupling distance. Furthermore, for the first time, two concepts—optical spectrum interference (OSI) and misjudge rate (MR)—are introduced to study the temperature-sensing resolution based on spectral interrogation. This work has some significance in the design of nanoscale optical sensors with high temperature sensitivity and a high sensing resolution. View Full-Text
Keywords: finite-difference time-domain (FDTD) method; dual hexagonal cavities; metal-insulator-metal (MIM) waveguide; plasmonic temperature sensor finite-difference time-domain (FDTD) method; dual hexagonal cavities; metal-insulator-metal (MIM) waveguide; plasmonic temperature sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xie, Y.; Huang, Y.; Xu, W.; Zhao, W.; He, C. A Plasmonic Temperature-Sensing Structure Based on Dual Laterally Side-Coupled Hexagonal Cavities. Sensors 2016, 16, 706.

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