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In view of the fact that most invisibility devices focus on linearpolarization cloaking and that the characteristics of mid infrared cloaking arerarely studied, we propose a cross circularly polarized invisibility carpetcloaking device in the mid infrared band. Based on the Pancharatnam Berry phaseprinciple, the unit cells with the cross circular polarization gradient phasewere carefully designed and constructed into a metasurface. In order to achievetunable cross circular polarization carpet cloaks, a phase change material isintroduced into the design of the unit structure. When the phase changematerial is in amorphous and crystalline states, the proposed metasurface unitcells can achieve high efficiency cross polarization conversion and reflectionintensity can be tuned. According to the phase compensation principle of carpetcloaking, we construct a metasurface cloaking device with a phase gradientusing the designed unit structure. From the near and far field distributions,the cross circular polarization cloaking property is confirmed in the broadbandwavelength range. The proposed cloaking device can effectively resist detectionof cross-circular polarization.

Broadband Cross-Circular Polarization Carpet Cloaking based on a Phase Change Material Metasurface in the Mid-infrared Region