研究目的
Investigating the tunable bandpass mid-infrared filter with microstructure and graphene, focusing on the transmission peaks' tunability based on the graphene's Fermi level changes.
研究成果
The research successfully demonstrates a tunable bandpass mid-infrared filter using graphene and microstructures, with transmission peaks adjustable via the graphene's Fermi level. The mechanism is attributed to changes in the graphene's refractive index, offering potential applications in mid-infrared microscopy and non-dispersive infrared analyzers.
研究不足
The study is limited by the simulation-based approach without physical fabrication and testing. The tunable range is constrained by the graphene's Fermi level adjustments, and the practical application may face challenges in precise control and environmental stability.
1：Experimental Design and Method Selection:
The study employs a tunable bandpass mid-infrared filter design incorporating graphene and microstructures, utilizing the guided-mode resonance (GMR) effect for narrow bandwidth performance. The theoretical model includes the Kubo formula for graphene surface conductivity and permittivity modeling.
2：Sample Selection and Data Sources:
The dielectric materials selected are silicon for the grating ridge and waveguide layer, and calcium fluoride as the substrate material.
3：List of Experimental Equipment and Materials:
The setup includes a dielectric grating with specific ridge width, period, filled factor, and height, two dielectric layers separated by graphene, and a calcium fluoride substrate.
4：Experimental Procedures and Operational Workflow:
Transmission spectra are simulated using the rigorous coupled-wave analysis (RCWA) method, with parameters optimized for the study.
5：Data Analysis Methods:
The analysis focuses on the transmission spectra changes with varying graphene Fermi levels, electric field distribution, and the influence of refractive indices on transmission peaks.
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