One-way absorption properties in asymmetric single-negative-based Cantor photonic crystals |
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| Institution: | 1. State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Physics, Cornell University, 117 Clark Hall, Ithaca, NY 14853, United States;1. School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing, 163318, PR China;2. College of Mechanical and Electrical Engineering, Daqing Normal University, Daqing, 163712, PR China;3. Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA;4. Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. Research Center of Applied Electromagnetics, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. State Key Laboratory of Millimeter Waves of Southeast University, Nanjing 210096,China |
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| Abstract: | In this work we theoretically study the one-way optical properties in asymmetric triadic-Cantor-set (TCS) photonic crystals (PCs), air/TCSN/G/TCSM/air, where TCSN is the stage N TCS composed of a lossy epsilon-negative (ENG) material and a lossy mu-negative (MNG) material. In addition, the defect layer G is a dielectric. Our results show that the absorption spectra are different in forward and backward propagation. Specially, it is first discovered that the one-way properties will disappear if the layer thicknesses are large. Besides, the layer thickness limit is smaller when the TCS stage is larger. Additionally, comparing with previous studies, we find that the type of interaction between the defect and non-defect modes is decided by the layer materials of the PC structure. |
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