论文标题
与极化的谐振晶格kerker效应在相变元表中
Polarization-independent resonant lattice Kerker effect in phase-change metasurface
论文作者
论文摘要
谐振晶格Kerker在周期性谐振器中的效应是Kerker效应的最有趣的概括之一，它与各种迷人的功能（例如散射管理和Huygens Metasurfaces）有关。但是，到目前为止，这种效应已被证明对入射极化敏感，从而限制了其应用。在这里，我们首次报道了与元素的元素共鸣晶格效应，由周期性GE $ _2 $ SE $ _2 $ _2 $ TE $ _5 $（GST）磁盘组成。对于平方晶格的这种跨表面，可以通过选择适当的GST晶体分数来实现电偶极子和磁性偶极表面晶状体谐振的光谱重叠。操作波长和所需的GST晶体分数可以方便地在大范围内调节，因为这些参数与磁盘尺寸和晶格周期线性缩放，从而极大地促进了设计。利用获得的共振晶格kerker效应，我们意识到了可重新配置和极化独立的晶格huygens的元曲面，动态相位调制接近$2π$且高透射率。这项工作将推动谐振晶格Kerker效应的工程，并在相位调制和波前控制中促进其应用。
Resonant lattice Kerker effect in periodic resonators is one of the most interesting generalizations of the Kerker effect that relates to various fascinating functionalities such as scattering management and Huygens metasurfaces. However, so far this effect has been shown to be sensitive to the incident polarization, restricting its applications. Here, we report, for the first time, polarization-independent resonant lattice Kerker effect in metasurfaces composed of periodic Ge$_2$Se$_2$Te$_5$ (GST) disks. For such a metasurface of square lattice, the spectrally overlap of the electric dipole and magnetic dipole surface lattice resonances can be realized by choosing an appropriate GST crystalline fraction regardless of the incident polarization. The operation wavelength and the required GST crystalline fraction can be conveniently tuned over large ranges since these parameters scale linearly with the disk size and the lattice period, greatly facilitating the design. Making use of the obtained resonant lattice Kerker effect, we realize a reconfigurable and polarization-independent lattice Huygens' metasurface with a dynamic phase modulation of close to $2π$ and high transmittance. This work will advance the engineering of the resonant lattice Kerker effect and promote its applications in phase modulation and wavefront control.
