论文标题
使用低损坏光相变材料的电气重新配置的非易失性跨表面
Electrically Reconfigurable Nonvolatile Metasurface Using Low-Loss Optical Phase Change Material
论文作者
论文摘要
与传统的散装相比，主动元信息有望具有可重新改善的紧凑性，坚固性，制造性和功能性的可重新配置光学器件。光相变材料（O-PCM）为具有较大索引对比度和非挥发性开关特性的主动跨表面设备提供了吸引人的材料解决方案。在这里，我们报告了我们认为是基于O-PCM的第一个电气重新配置的非易失性元信息。设备中使用的O-PCM合金GE2SB2SE4TE1（GSST）独特地结合了巨大的非挥发指数调制能力，宽带低光学损耗和可逆的切换量，从而在活性O-PCM介质中显着增强了光 - 光 - 互动。利用这些有利的属性，我们证明了连续可调的主动跨面，具有创纪录的一半光谱调谐范围，并且大型光学对比度超过400％。我们进一步制定了对极化的相位梯度跨表面的原型，以实现动态光束转向。
Active metasurfaces promise reconfigurable optics with drastically improved compactness, ruggedness, manufacturability, and functionality compared to their traditional bulk counterparts. Optical phase change materials (O-PCMs) offer an appealing material solution for active metasurface devices with their large index contrast and nonvolatile switching characteristics. Here we report what we believe to be the first electrically reconfigurable nonvolatile metasurfaces based on O-PCMs. The O-PCM alloy used in the devices, Ge2Sb2Se4Te1 (GSST), uniquely combines giant non-volatile index modulation capability, broadband low optical loss, and a large reversible switching volume, enabling significantly enhanced light-matter interactions within the active O-PCM medium. Capitalizing on these favorable attributes, we demonstrated continuously tunable active metasurfaces with record half-octave spectral tuning range and large optical contrast of over 400%. We further prototyped a polarization-insensitive phase-gradient metasurface to realize dynamic optical beam steering.
