研究目的
Investigating the design and numerical analysis of a plasmonic metamaterial for enhanced optical absorption based on titanium carbide (Ti3C2Tx) MXene sheets.
研究成果
The study demonstrates that MXene-based metamaterial absorbers with step-like changes in the width of the top MXene strips can achieve an absorption peak of near 100% at 800 nm, with the field distribution confined to the lossless dielectric part. The approach extends the design toolbox for plasmonics and ensures a new degree of design freedom.
研究不足
The analytical dependences for the complex dielectric permittivity show good agreement for the real part but less so for the imaginary (lossy) part. The performance comparison with other structures is orientational only due to the disparate nature of the structures compared.
1：Experimental Design and Method Selection:
The study utilizes the finite element method to simulate the scattering parameters of the MXene-based metamaterial and applies the Drude–Lorentz model to derive an analytical expression for complex permittivity of Ti3C2Tx MXene based on experimental measurements.
2：Sample Selection and Data Sources:
The metamaterial is built as a sandwich with a solid MXene bottom layer, a lossless dielectric middle layer, and an MXene mesh top layer. The unit cell of the periodic top mesh consists of two crossed ultrathin MXene strips.
3：List of Experimental Equipment and Materials:
The materials used include 100 nm thick titanium carbide (Ti3C2Tx) MXene sheets and a lossless dielectric spacer made of fused silica.
4：Experimental Procedures and Operational Workflow:
The geometry of the metamaterial absorber is designed with step-wise varying width of the top surface MXene strip. The spectral dispersion and spatial field distribution of a TM polarized plane wave incident normally from above to the absorber surface are simulated.
5：Data Analysis Methods:
The parametric frequency sweep is utilized to determine the spectral dispersion of the scattering parameters.
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