Open AccessDual-band polarization convertor based on electromagnetically induced transparency (EIT) effect in all-dielectric metamaterial
Author(s) -
Lei Zhu,
Xuezeng Zhao,
Feng Miao,
Bablu K. Ghosh,
Lijun Dong,
Bangyi Tao,
FanYi Meng,
Wei Nan Li
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.012163
Subject(s) - electromagnetically induced transparency , metamaterial , optics , polarization (electrochemistry) , physics , dielectric , microwave , anisotropy , terahertz radiation , linear polarization , materials science , optoelectronics , chemistry , quantum mechanics , laser
In this study, electromagnetically induced transparency (EIT) effect in all-dielectric metamaterial for dual-band linear-to-circular (LTC) polarization conversion is demonstrated numerically and experimentally. The unit cell is composed of three ceramic blocks with different sizes. Due to the anisotropy of metamaterial and polarization dependence of subsequent EIT effects, transmission spectra for x- and y-polarized incident waves are realized to induce LTC polarization conversion. It is numerically demonstrated that a linearly polarized incident wave is transformed to a nearly perfect circularly polarized wave at around 6.24 and 6.38 GHz. The corresponding ellipticity and transmittivity are about 0.96, 0.6 and 0.94, 0.37, respectively. A metamaterial sample is fabricated and its transmission spectra are measured. The measured results are nearly equal to the simulated results. This LTC polarization convertor, with low loss and ultra thinness, may expand the application of EIT metamaterials, and it can be extended to terahertz up to optical bands. Such a design may find potential applications in microwave wave plates and metamaterial antennas, or other electromagnetic control devices.