Manipulating radiation beams by symmetry of magnetic photonic crystals

Abstract

We theoretically and experimentally study the radiation of current line source embedded in two-dimensional photonic crystals (PCs) made of ferrite rods. Depending on the symmetry of the PCs, the source radiation working at the band edge of the PCs can be multiple or single beam radiation with narrow beam width. Different ways to change the PC symmetry are proposed. Taking advantage of tunable bandgap of the magnetic PC and by lowering the symmetry of the PC, the radiation direction and its working frequency can be reconfigured by bias magnetic field. Experiments demonstrate the dependence of radiation on the PC symmetry.

Metamaterials and Their Application in the Performance Enhancement of Reconfigurable Antennas: A Review

“…The metamaterial-loaded antenna can be used for a side-lobe cancelation mechanism, which is widely used in smart vehicle applications [ 116 ]. Magnetic photonic crystals (PCs) are also used to control the radiation pattern of antennas, known as the optical reconfiguration method [ 117 ]. In [ 118 ], an antenna operating at ultra-high frequency (UHF) is reported for biomedical applications.…”

One-way propagation of bulk states and robust edge states in photonic crystals with broken inversion and time-reversal symmetries

“…By employing the nonreciprocity and the nontrivial topology characterized by nonzero Berry phase, one-way propagation of electromagnetic (EM) waves has been realized [22][23][24]. Since then, magnetic PCs have been studied to observe topologically nontrivial edge states [25][26][27][28] and control wave propagation [29][30][31][32].…”