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

Yiyuan Xie¹, Yexiong Huang², Weihua Xu³

¹School of Electronic and Information Engineering, Southwest University, Chongqing 400715, China. yyxie@swu.edu.cn.

Sensors (Basel, Switzerland)

|May 20, 2016

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This study introduces a novel plasmonic temperature sensor using a metal-insulator-metal waveguide. The sensor achieves high sensitivity and resolution by optimizing cavity coupling for precise temperature monitoring.

Area of Science:

Photonics and Nanotechnology
Optical Sensing
Plasmonics

Background:

Plasmonic nanostructures offer unique optical properties for sensing applications.
Metal-insulator-metal (MIM) waveguides with coupled cavities are explored for enhanced light-matter interactions.

Purpose of the Study:

To propose and numerically investigate a novel plasmonic temperature-sensing structure.
To optimize the sensor's performance by tuning structural parameters for high sensitivity and resolution.

Main Methods:

Finite-difference time-domain (FDTD) method for numerical simulations.
Analysis of transmission spectra to identify resonance dips and their characteristics.
Investigation of temperature-dependent spectral shifts.

Keywords:

dual hexagonal cavities finite-difference time-domain (FDTD) method metal-insulator-metal (MIM) waveguide plasmonic temperature sensor

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Main Results:

A resonance dip was observed in the transmission spectrum of the proposed MIM waveguide structure.
Tuning the coupling distance narrowed the resonance dip's full width at half maximum (FWHM) and maximized the extinction ratio.
Temperature sensitivity was found to be dependent on cavity side length and coupling distance.

Conclusions:

The proposed plasmonic structure demonstrates significant potential for nanoscale optical temperature sensing.
Introduction of optical spectrum interference (OSI) and misjudge rate (MR) provides new metrics for evaluating sensing resolution.
The study contributes to the design of high-performance optical sensors for precise temperature measurement.