Tunable stealth curved metasurface based on laser reversible induction technology

Tunable metasurfaces have been proven to be a reliable method for modulating electromagnetic wave at the wavelength scale. However, most tunable metasurfaces rely on electrical control, making it challenging to fabricate large-scale samples. In order to achieve rapid, reversible, and flexible conformal manufacturing of tunable metasurfaces, the influence of laser tilting induction technology on the phase transition of GeTe film was systematically studied for the first time, and the phase-amplitude composite electromagnetic stealth control method was proposed based on the GeTe characteristics before and after phase transition. The phase characteristics of the resonant unit and the electromagnetic scattering characteristics of different array arrangements were designed and analyzed, and the low reflection function of the curved metasurface in the case of oblique incidence was analyzed. The simulation and measured results show that the curved metasurface has excellent independent phase and amplitude control capabilities. The reflectivity of the prepared sample is lower than -10 dB within 8.9-14.8 GHz and 6.1-10.5 GHz before and after phase transition, respectively. It has high stability within 40 degrees of oblique incidence. The proposed method has significant advantages in design and manufacturing, which can be a good candidate for military stealth materials, conformal electromagnetic windows and beam shapers.