研究目的
Investigating the ultra-high refractive index sensing structure based on a metal-insulator-metal waveguide-coupled T-shape cavity with metal nanorod defects for refractive index and temperature sensing applications.
研究成果
The proposed ultra-high plasmonic refractive sensing structure demonstrates high sensitivity for refractive index and temperature sensing, with potential applications in optical on-chip nanosensors. The design's simplicity and ease of fabrication make it promising for future photonic circuits and biosensors.
研究不足
The study is limited by the technical constraints of the finite element method and the potential for optimization in the design of the plasmonic MIM waveguide for higher sensitivity and tunability.
1：Experimental Design and Method Selection:
The study employs finite element method (FEM) with perfect matched layers absorbing boundary condition to analyze the transmittance spectrum properties of the proposed structure.
2：Sample Selection and Data Sources:
The study uses a two-dimensional plasmonic MIM waveguide structure with a slit, a laterally coupled T-shape cavity, and several silver nanorod defects.
3：List of Experimental Equipment and Materials:
The materials include air and silver, with the testing liquid or gas loaded in the waveguide slit and the T-shape cavity.
4：Experimental Procedures and Operational Workflow:
The numerical simulation was performed using 2-D FEM, with TM-polarized incident EM wave coupled to the fundamental SPP mode.
5：Data Analysis Methods:
The transmittance spectrum is calculated by parameter scanning the incident wavelength in steps of 1 nm, and the transmittance is calculated by T = Pout/Pin.
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