研究目的
Investigating the electromagnetically induced transparency (EIT)-like effects in planar metamaterials (MMs) at microwave frequencies and achieving multi-spectral EIT-like effects through bright- and quasi-dark-mode coupling and lattice mode coupling.
研究成果
The study successfully demonstrated multi-spectral EIT-like effects in a single-layer metamaterial structure through the manipulation of dipole-quadrupole and lattice mode coupling. The proposed design offers advantages in applications such as low-loss slow-light devices and multiple switching sensors.
研究不足
The fabrication of complex multilayered or stacked structures for multi-spectral EIT effects is time-consuming and requires precise processes, which may hinder fundamental applications.
1：Experimental Design and Method Selection:
The study utilized planar metamaterials consisting of cut-wire resonator/ring resonator to achieve EIT-like effects. The design involved manipulating dipole-quadrupole and lattice mode coupling to induce strong Fano resonance.
2：Sample Selection and Data Sources:
The samples were fabricated from a printed circuit board with a copper film on a FR4 substrate. The transmission spectra were measured in a microwave anechoic chamber.
3：List of Experimental Equipment and Materials:
A Hewlett Packard E8362B network analyzer and standard-gain horn antennas were used for measurements. The metallic pattern was fabricated using conventional photolithography.
4：Experimental Procedures and Operational Workflow:
The transmission spectra were calculated and measured under normal incidence conditions. The distance between the antennas and the sample was kept at 150 cm to remove near-field effects.
5：Data Analysis Methods:
The numerical calculations were performed using CST Microwave Studio, and the transmission spectra were analyzed to observe the EIT-like effects.
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