研究目的
To study three designs of square ring resonator (SRR) based on metal-insulator-metal (MIM) waveguides for gas sensing applications, focusing on their transmission characteristics, sensitivity, and figure of merit.
研究成果
The study demonstrates that design 3 of the square ring resonator achieves the highest sensitivity (1320 nm/RIU) and figure of merit (16.7) at a height of 200 nm, making it suitable for detecting slight changes in refractive index. Asymmetrical designs and variations in height can enhance sensor performance, with potential applications in integrated optical circuits and on-chip nanosensors.
研究不足
The study is based on numerical simulations using FEM, which may not fully capture real-world fabrication imperfections or experimental noise. The sensitivity and performance are evaluated for specific design parameters, and practical implementation might face challenges in fabrication and integration.
1：Experimental Design and Method Selection:
The study uses finite element method (FEM) simulations via COMSOL software to model and analyze the plasmonic structures. The designs involve MIM waveguides coupled with square ring resonators of varying geometries.
2：Sample Selection and Data Sources:
The structures are simulated with parameters such as coupling distance, side length, and height of the SRR. The materials used are silver for the metal and air for the insulator.
3：List of Experimental Equipment and Materials:
COMSOL software for simulations; silver and air as materials; no physical equipment is mentioned as it is a simulation-based study.
4：Experimental Procedures and Operational Workflow:
Simulations are performed by exciting the fundamental TM mode with a plane wave, setting scattering boundary conditions, and calculating transmission spectra and electric field distributions. Parametric sweeps are used to vary structural parameters and refractive indices.
5：Data Analysis Methods:
Sensitivity, figure of merit (FoM), and quality factor (Q-factor) are calculated using formulas based on resonance wavelength shifts and full width at half maximum (FWHM).
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