研究目的
To propose and analyze a multi-channel Fano resonant structure based on subwavelength metal–insulator–metal (MIM) waveguides for use as a chip-scale refractive index sensor and optical filter.
研究成果
The proposed multi-channel Fano resonant structure based on MIM waveguides demonstrates high sensitivity and figure of merits, making it suitable for chip-scale refractive index sensing and optical filtering applications. The structure's ability to achieve four-channel Fano resonances with considerable performances suggests potential for highly integrated photonic circuits.
研究不足
The study is theoretical and relies on simulations, which may not fully capture all real-world conditions. The practical implementation of the proposed structure may face challenges in fabrication and integration with existing optical systems.
1：Experimental Design and Method Selection:
The structure is designed with two MIM output ports associated with specific side-coupled cavities located at the center and quarter positions of an end-coupled cavity. The interference between dark and bright modes is utilized to achieve dual-channel Fano resonances. The finite difference time domain (FDTD) method and multiple interference coupled mode theory (MICMT) method are used for analysis.
2：Sample Selection and Data Sources:
The study uses a theoretical model with specified dimensions and materials for the MIM waveguides and cavities.
3：List of Experimental Equipment and Materials:
The width of MIM waveguides and all the resonators are set to 50 nm. The lengths of cavities A, B, and C are 500, 420, and 475 nm, respectively. The coupling distances from cavities A, B, and C to the MIM waveguides are all defined as 10 nm.
4：Experimental Procedures and Operational Workflow:
The input light is set as a plane light wave, with perfect matching layers (PML) around the structure to absorb the escape electromagnetic field energy. The number of layers in x- and y-directions is defined as
5：Data Analysis Methods:
The transmittance and phase responses are analyzed to investigate the Fano resonances, sensitivities, and figure of merits (FOM).
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