研究目的
Investigating the response of coupled modes in metal-dielectric multilayer planar structures and the appearance of Fano resonances as a result of modes interaction.
研究成果
The developed coupled-mode theory for multilayer metal-dielectric structures demonstrates that asymmetric resonances observed in ATR spectra can be regarded as Fano resonances, originating from WG mode and SPP mode coupling. The results may open new ways for developing applications of narrow asymmetric resonances in optics.
研究不足
The study focuses on theoretical analysis and numerical experiments; practical implementation and experimental validation are not discussed.
1：Experimental Design and Method Selection:
The study employs a coupled-mode theory to analyze the interaction between surface plasmon polariton (SPP) and waveguide (WG) modes in metal-dielectric multilayer structures.
2：Sample Selection and Data Sources:
The structure consists of a metal layer attached to a high-index waveguide by a low-index spacer layer.
3：List of Experimental Equipment and Materials:
Silver layer (refractive index
4：234245+i21426), SiO2 spacer layer (thickness 2800 nm, refractive index 53413), TiO2 waveguide layer (thickness 141 nm, refractive index 30782), water environment (refractive index 32604+i00000513). Experimental Procedures and Operational Workflow:
Numerical experiments at the wavelength of 1064 nm to obtain ATR spectra.
5：Data Analysis Methods:
Approximation of the response from SPP mode by asymmetric Fano line shape and from WG mode by Lorentzian.
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