Broadband cross-circular polarization carpet cloaking based on a phase change material metasurface in the mid-infrared region |
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Authors: | Bo Fang Dantian Feng Peng Chen Lijiang Shi Jinhui Cai Jianmin Li Chenxia Li Zhi Hong Xufeng Jing |
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Affiliation: | 1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China2. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China3. Centre for THz Research, China Jiliang University, Hangzhou 310018, China4. Hangzhou Hangxin Qihui Technology Co., Ltd, Hangzhou 310026, China5. University of Shanghai for Science and Technology, No. 516 Jung Gong Road, Shanghai 200093, China |
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Abstract: | In view of the fact that most invisibility devices focus on linear polarization cloaking and that the characteristics of mid-infrared cloaking are rarely studied, we propose a cross-circularly polarized invisibility carpet cloaking device in the mid-infrared band. Based on the Pancharatnam–Berry phase principle, the unit cells with the cross-circular polarization gradient phase were carefully designed and constructed into a metasurface. In order to achieve tunable cross-circular polarization carpet cloaks, a phase change material is introduced into the design of the unit structure. When the phase change material is in amorphous and crystalline states, the proposed metasurface unit cells can achieve high-efficiency cross-polarization conversion, and reflection intensity can be tuned. According to the phase compensation principle of carpet cloaking, we construct a metasurface cloaking device with a phase gradient using the designed unit structure. From the near- and far-field distributions, the cross-circular polarization cloaking property is confirmed in the broadband wavelength range of 9.3–11.4 µm. The proposed cloaking device can effectively resist detection of cross-circular polarization. |
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Keywords: | metamaterial metasurface cloaking |
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