研究目的
Investigating the storage and retrieval of electromagnetic waves in metamaterials by dynamical control of EIT-like effects, including frequency conversion and extension of storage time using parametric amplification.
研究成果
The study demonstrates the coherent storage and retrieval of electromagnetic waves in EIT-like metamaterials, frequency conversion during the storage process, and the extension of storage time by parametric amplification. The findings suggest that metamaterials could potentially store whole pulses with arbitrary temporal or spatial modes by distributing the structures in three dimensions.
研究不足
The storage time is limited by the lifetime of the trapped mode, and the Ohmic loss in the varactor diode degrades the function of electromagnetic-wave storage. The minimum width of the transparency window is limited by the linewidth of an isolated trapped mode.
1：Experimental Design and Method Selection:
The study employs tunable metamaterials loaded with variable capacitors to dynamically modulate EIT-like effects and control asymmetric spectra unique to Fano resonance.
2：Sample Selection and Data Sources:
Multi-layered metamaterials designed for operation in the microwave region are used.
3：List of Experimental Equipment and Materials:
The setup includes variable capacitors, a copper film on a dielectric substrate, and an open-type waveguide for transmission measurements.
4：Experimental Procedures and Operational Workflow:
The experiment involves modulating the bias voltage to control the EIT-like effect, storing and releasing electromagnetic waves, and measuring the transmission spectra and group delays.
5：Data Analysis Methods:
The analysis includes measuring the transmission power and parametric gain to evaluate the storage and retrieval efficiency and the extension of storage time.
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