研究目的
Investigating the role of coupling gap size in the formation and performance of plasmonic Fano resonances in homotactic aluminum rod trimer (HART) structures.
研究成果
The study demonstrates that the Fano dip of HART with a smaller coupling gap size has a higher red-shift speed when increasing the refractive index of surrounding environment or the length of HART with a fixed axial ratio. This provides insights into the key role of coupling gap in the performance of Fano structures.
研究不足
The study is limited to simulations and does not include experimental validation. The focus is on aluminum nanostructures, and the findings may not be directly applicable to other materials.
1：Experimental Design and Method Selection:
The study involves designing a homotactic aluminum rod trimer (HART) to form plasmonic Fano resonances. The plasmon hybridization model and far field images are used to describe the formation mechanism of Fano resonance.
2：Sample Selection and Data Sources:
The study uses aluminum nanorods with specific dimensions and configurations to investigate the Fano effect.
3：List of Experimental Equipment and Materials:
The study employs finite difference time domain method (FDTD, Lumerical Solutions) and finite element method (FEM, Comsol Multiphysics) for simulations.
4：Experimental Procedures and Operational Workflow:
The optical spectra are obtained using a total-field scattered-field (TFSF) source with a spectral range from 300 to 800 nm. An override 2 nm mesh around the structures is used, and perfectly matched layer (PML) boundary condition is set for all three dimensions.
5：Data Analysis Methods:
The total scattering cross sections are obtained by integrating the scattered power flux over an enclosed surface outside the TFSF source. The surface charge distribution is calculated by the boundary value expression of electromagnetic field, and the far field pattern is obtained from the far-field module of simulation platform.
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