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High-Property Refractive Index and Bio-Sensing Dual-Purpose Sensor Based on SPPs
Shubin Yan1,2, Pengwei Liu1,2,3, Zhanbo Chen1
1School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.
Micromachines
|June 24, 2022
Summary
A novel plasmon resonance sensor using a metal-insulator-metal waveguide and nano-cavity achieves high sensitivity for refractive index and biosensing applications. Its design offers a simple, reliable, and easily integrated solution for advanced sensing devices.
Area of Science:
- Plasmonics
- Nanophotonics
- Sensor Technology
Background:
- Surface plasmon polaritons (SPPs) enable highly sensitive optical sensing.
- Metal-insulator-metal (MIM) waveguides offer unique electromagnetic field confinement.
- Nano-cavity structures can enhance light-matter interactions for sensing.
Purpose of the Study:
- To design and analyze a novel plasmon resonance sensor structure.
- To investigate its performance for refractive index sensing and biosensing.
- To evaluate the impact of structural parameters on sensor performance.
Main Methods:
- Design of a metal-insulator-metal (MIM) waveguide coupled with a transverse ladder-shaped nano-cavity (TLSNC).
- Analysis of transmission characteristics using multimode interference coupling mode theory (MICMT).
- Numerical simulations using finite element analysis (FEA).
Main Results:
- The proposed structure exhibits four high-quality formants in its transmission spectrum.
- Achieved a maximum sensitivity of 3000 nm/RIU with a figure of merit (FOM) of 9.7 × 10^5 for refractive index sensing.
- Demonstrated high sensitivities for detecting sodium ions (0.45 nm/mgdL⁻¹), potassium ions (0.625 nm/mgdL⁻¹), and glucose (5.5 nm/mgdL⁻¹).
Conclusions:
- The designed TLSNC-coupled MIM waveguide sensor offers high performance for refractive index sensing.
- The structure is suitable for biosensing applications, detecting various ions and glucose concentrations.
- Advantages include simple construction, wide working band, high reliability, and easy nano-scale integration.
