研究目的
To overcome the limitations of single narrowband absorption, low absorption peak, and non-independently tunable multiple bands in graphene-based metamaterial absorbers by proposing a dual-band absorber with independently tunable absorption bands at mid-infrared frequencies.
研究成果
The proposed dual-band metamaterial absorber based on graphene at mid-infrared frequencies allows for dynamically and independently tunable resonance peaks by adjusting the gate voltage of corresponding graphene films, suggesting wide applications in optical devices.
研究不足
The complexity of design and fabrication difficulties increases with the number of independently tunable resonators, potentially limiting the extension of spectral coverage.
1：Experimental Design and Method Selection:
The study involves designing a dual-band metamaterial absorber using graphene, with two cascaded metallic resonators of different sizes in the unit cell to achieve independently tunable absorption bands.
2：Sample Selection and Data Sources:
The samples include metallic resonators, a dielectric layer, and a gold ground substrate, with graphene placed under the resonators.
3：List of Experimental Equipment and Materials:
Gold crosses of different sizes, graphene films, dielectric layer, gold ground substrate.
4：Experimental Procedures and Operational Workflow:
The absorption spectrum was researched by modulating the Fermi energy of graphene under the resonators using gate voltages.
5：Data Analysis Methods:
The absorption spectrum was analyzed to observe the shifts in resonant wavelengths and the changes in absorption peaks.
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