研究目的
To propose a conductively coupled terahertz metallic metamaterial exhibiting analog of electromagnetically induced transparency (EIT), where the interaction between bright and dark mode antennae is via surface currents rather than near-field coupling, using cheap aluminum foil for fabrication.
研究成果
The study successfully demonstrated a conductively coupled terahertz metallic EIT metamaterial, where the interaction via surface currents induces an EIT-like phenomenon. The use of cheap aluminum foil and flexible substrates offers practical advantages for future applications in flexible microstructures.
研究不足
The experimental results showed some differences from the simulation results, attributed to the formation of an oxide film on aluminum surfaces and discrepancies in the fabricated structure's dimensions. The conductivity reduction and size differences affected the EIT amplitude and frequency.
1：Experimental Design and Method Selection:
The design involves a fork-shaped periodic array formed by interconnecting aluminum bar resonators and aluminum SRRs. Numerical simulations and experiments were conducted to analyze the mechanism.
2：Sample Selection and Data Sources:
The metamaterial was fabricated using aluminum foil on a PET substrate. Lithography and wet etching processes were employed.
3：List of Experimental Equipment and Materials:
Aluminum foil, PET substrate, laser direct writing equipment for lithography, and wet etching materials.
4：Experimental Procedures and Operational Workflow:
Fabrication involved lithography and wet etching on a PET-aluminum film composite. The sample was then tested using terahertz time domain spectroscopy (THz-TDS).
5：Data Analysis Methods:
The transmission spectra were analyzed to observe the EIT-like phenomenon, with surface current and electric field distributions simulated to understand the mechanism.
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