Analog of electromagnetically induced absorption and transparency phenomena of nonreciprocity and polarization sensitivity properties in layered topology metastructure
Hai-Ning Ye, Bao-Fei Wan, Haifeng Zhang
The nonreciprocal and polarization-sensitive performances of analog of electromagnetically induced absorption (EIA-like) and electromagnetically induced transparency (EIT-like) effects are investigated by the transfer matrix method (TMM), and the layered topology metastructure containing microwave magnetized plasma is used to construct suitable bright resonators, dark resonators, and quasi-dark resonators. In the case of low frequencies, the incident TM wave fosters an evident nonreciprocal EIA-like effect, and its nonreciprocal absorptivity is higher than 0.8, while the EIA-like phenomenon fails to occur in the case of the incident TE wave. For the case of high-frequency incidence, the EIT-like and EIA-like effects can be switched by converting the TM wave into the TE one under the case of backward propagation, and the maximum nonreciprocal absorptivity can exceed 0.9 if the TE wave propagates. The effects of some critical variables such as incident angle, plasma frequency, plasma cyclotron frequency, and plasma layer thickness on nonreciprocal and polarization-sensitive characteristics have been explored, and the slow light property of the EIT-like effect has also been briefly involved, and its group refractive index can reach 1224. The energy level transition theory and the optimized two-oscillator model are also analyzed to explain the generation of EIA-like and EIT-like phenomena in depth. We hope that the relevant phenomena will be interesting for slow light devices, two-way communication of electromagnetic waves, and polarization separation devices.
Ain Shams Engineering Journal•Sep 24, 2024•1 citation