Asymmetric electromagnetic wave propagation supported by magnetic metamaterials and graded photonic crystals

Qingtao Ba; Meiling Wang; Huabing Wu; Qilin Luo; Shiyang Liu

doi:10.1117/12.2505880

15 November 2018 Asymmetric electromagnetic wave propagation supported by magnetic metamaterials and graded photonic crystals

Qingtao Ba, Meiling Wang, Huabing Wu, Qilin Luo, Shiyang Liu

Author Affiliations +

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 1096434 (2018) https://doi.org/10.1117/12.2505880
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

Based on the multiple scattering theory and Mie theory, we have investigated two types of electromagnetic systems with broken symmetries, which are used to manipulate the propagation of electromagnetic waves. The former one is magnetic metamaterial made of an array of ferrite rods arranged either in periodic or non-periodic configurations, which bears the time-reversal-symmetry (TRS) breaking by applying a bias magnetic field. It can act as a perfect unidirectional absorber that can absorb the incident beam at a specified direction completely, while reflect nearly one half of the incident beam at the symmetrically opposite direction. The underlying physics lies in the excitation of magnetic surface plasmon that behaves differently for various incident directions. The phenomenon can also be understood by calculating the photonic band diagrams and effective constitutive parameters. The latter one is all-dielectric complex graded photonic crystal (GPC) consisting of dielectric rod dimers with a rotational gradient introduced layer by layer, which therefore breaks the spatial inversion symmetry of the system. The GPC is shown to split the incident beam into two separate ones, while for the light beam incident from opposite direction the focusing effect can be observed. The phenomenon can be interpreted by calculating the photonic band diagrams and iso-frequency curves. By tuning the gradient, the performance and the efficiency can be further controlled. The comparative study of configurations with two kinds of broken symmetries is significant for the understanding unidirectional wave propagation and the design of related electromagnetic devices.

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Qingtao Ba, Meiling Wang, Huabing Wu, Qilin Luo, and Shiyang Liu "Asymmetric electromagnetic wave propagation supported by magnetic metamaterials and graded photonic crystals", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 1096434 (15 November 2018); https://doi.org/10.1117/12.2505880

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KEYWORDS

Magnetism

Wave propagation

Metamaterials

Radio propagation

Gaussian beams

Electromagnetism

Photonic crystals

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