研究目的
Designing and investigating an ultra-broad bandgap plasmonic based filter consisting of a metal-insulator-metal waveguide with symmetrical stubs and defects for the first time, aiming to achieve a tunable wide bandgap and explore its potential in integrated optical circuits for optical trapping and tunable devices.
研究成果
The proposed plasmonic filter with symmetrical stubs and defects achieves a tunable wide bandgap, significantly larger than structures without defects. The bandgap performance is influenced by the defects and the number of periods, attributed to changes in effective refractive index and plasmon resonance modes. This design offers potential for applications in integrated optical circuits and tunable devices.
研究不足
The study is limited by the simulation-based approach, which may not fully capture real-world fabrication challenges and material imperfections. Additionally, the focus on specific dimensions and materials may limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The study employs finite element method (FEM) simulations to investigate the plasmonic filter's performance. The design includes a bus waveguide and symmetrical multiple-stub-shaped cavities with silver defects.
2：Sample Selection and Data Sources:
The materials used are silver and air, with specific dimensions for the waveguide width, stub depth, and defect radius.
3：List of Experimental Equipment and Materials:
The simulation utilizes COMSOL Multiphysics software for FEM analysis. The materials include silver and air, with specific parameters for waveguide and stub dimensions.
4：Experimental Procedures and Operational Workflow:
Simulations are performed to calculate transmittance spectra and analyze electric and magnetic field intensity distributions under various conditions.
5：Data Analysis Methods:
The transmittance is calculated by the ratio of output power to input power, and field distributions are analyzed to understand resonance modes and bandgap performance.
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