Mr. Qingtao Bao Profile

Qingtao Bao

at Zhejiang Normal University

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Proceedings Article | 20 December 2019 Paper

Comparative study of the beam steering by a single layer of dielectric and magnetic cylinders

Shuxu Liu, Lin Zhang, Qingtao Ba, Huabing Wu, Meiling Wang, Shiyang Liu

Proceedings Volume 11209, 112091Q (2019) https://doi.org/10.1117/12.2547576

KEYWORDS: Dielectrics, Magnetism, Scattering, Laser scattering, Gaussian beams, Negative refraction, Beam steering, Electromagnetic radiation, Reflection, Wave propagation

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Based on the Mie theory and the multiple scattering theory, we have performed a comparative study on the beam steering by two kinds of systems which are composed of either a single layer of dielectric rods or a single layer of ferrite rods. It is shown that for both systems the incident Gaussian beam can be negatively refracted and with appropriate adjusting the related parameters the total reflection can be implemented as well. However, the essences to realize the phenomena are different with the former system keeping the reciprocal property and the latter one exhibiting nonreciprocal property. For the dielectric system, to switch the functionality the resonance is tuned by the size of the dielectric rod, while for the magnetic system it is realized by simply reversing the bias magnetic field due to the nonreciprocity of the ferrite materials under the bias magnetic field (BMF). By examining the field profiles we can find more details, where the dielectric system is operable for the transverse electric (TE) mode and the magnetic system is effective for the transverse magnetic (TM) mode. The electromagnetic field patterns associated with the single dielectric rod and ferrite rod exhibit different forward and backward scattering features in case of negative refraction and total reflection, which is further enhanced by the constructive and destructive interference of scattering fields from the all the rods in the particle array. The results are significant for the understanding of resonance in reciprocal and nonreciprocal systems and also inspiring for the flexible beam steering.

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