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Robust and Tunable One-Way Magnetic Surface Plasmon Waveguide: An Experimental Demonstration |
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| Authors: | Jian Shen Shiyang Liu Huaiwu Zhang S. T. Chui Zhifang Lin Xin Fan Xiaoming Kou Qi Lu John Q. Xiao |
| Affiliation: | 1. State Key Laboratory of Electronic Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, People??s Republic of China 2. Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA 3. Institute of Information Optics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, People??s Republic of China 5. State Key Laboratory of Surface Physics (SKLSP) and Department of Physics, Fudan University, Shanghai, 200433, People??s Republic of China 4. Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA |
| Abstract: | We have demonstrated experimentally a one-way magnetic surface plasmon (MSP) electromagnetic (EM) waveguide in the microwave range based on the magnetic photonic crystals (MPCs). The waveguide exhibits asymmetric transmission of EM waves in the frequency range near the MSP resonance for an MPC, such that a significant one-way propagation can be observed in the channel between the two MPC slabs, each in an external static magnetic field (ESMF) of opposite directions. The one-way waveguide is not only immune to interstitial metal defects but also robust against the disorder of rod position. Furthermore, its working frequency can be flexibly tuned by an ESMF, which makes it more favorable for the design of EM devices. The physics is related to the broken time-reversal symmetry of the MSP band states and the excitation of a giant circulation of the energy flow, similar to the case in the quantized Hall effect. |
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