Nonreciprocal wide-angle bidirectional absorber based on one-dimensional magnetized gyromagnetic photonic crystals
You-Ming Liu(刘又铭)1, Yuan-Kun Shi(史源坤)1, Ban-Fei Wan(万宝飞)1, Dan Zhang(张丹)2, and Hai-Feng Zhang(章海锋)1,†
1 College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China; 2 College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
Abstract We propose magnetized gyromagnetic photonic crystals (MGPCs) composed of indium antimonide (InSb) and yttrium iron garnet ferrite (YIGF) layers, which possess the properties of nonreciprocal wide-angle bidirectional absorption. Periodical defects in the MGPCs work as filters. Absorption bands (ABs) for the positive and negative propagations arise from the optical Tamm state and resonance in cavities respectively, and they prove to share no overlaps in the studied frequency range. Given ω=2.0138 THz, for the positive propagation, the ABs in the high-frequency range are localized in the interval between 0.66ω and 0.88ω. In the angular range, the ABs for the TE and TM waves reach 60° and 51°, separately. For the negative propagation, the ABs in the low-frequency range are localized in the interval between 0.13ω and 0.3ω. The ABs extend to 60° for the TE waves and 80.4° for the TM waves. There also exists a narrow frequency band in a lower frequency range. The relevant factors, which include the external temperature, the magnetic fields applied to the YIGF, the refractive index of the impedance matching layer, and the defect thickness, are adjusted to investigate the effects on the ABs. All the numerical simulations are based on the transfer matrix method. This work provides an approach to designs of isolators and so on.
Fund: Project supported by the College Student Innovation Training Program of Nanjing University of Posts and Telecommunications, and the Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) (Grant No. CX(21)3187).
You-Ming Liu(刘又铭), Yuan-Kun Shi(史源坤), Ban-Fei Wan(万宝飞), Dan Zhang(张丹), and Hai-Feng Zhang(章海锋) Nonreciprocal wide-angle bidirectional absorber based on one-dimensional magnetized gyromagnetic photonic crystals 2023 Chin. Phys. B 32 044203
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