Metasurfaces and nanoantennas are redefining what can be achieved in terms of optical beam manipulation, as they provide a versatile design platform towards moulding the flow of light at will. Yet, once a conventional metasurface is designed and realised, its effect on optical beams is repeatable and stationary, thus its performance is ‘locked-in’ at the fabrication stage. A much wider range of applications, such as dynamic beam steering, reconfigurable and dynamic lensing, optical modulation and reconfigurable spectral filtering, could be achieved if real-time tuning of metasurface optical properties were possible. Chalcogenide phase-change materials, because of their rather unique ability to undergo abrupt, repeatable and non-volatile changes in optical properties when switched between their amorphous and crystalline phases, have in recent years been combined with metasurface architectures to provide a promising platform for the achievement of dynamic tunability. In this paper...

中文翻译：

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硫族化物相变材料可实现可调光学超表面：从可见光到太赫兹

超表面和纳米天线正在重新定义在光束操纵方面可以实现的目标，因为它们提供了一种通用的设计平台，可以随意成型光流。但是，一旦设计并实现了常规的超颖表面，它对光束的影响便是可重复且稳定的，因此其性能在制造阶段就被“锁定”了。如果可以对超表面光学特性进行实时调整，则可以实现更广泛的应用，例如动态光束转向，可重配置和动态透镜，光学调制和可重配置光谱过滤。硫属化物相变材料，因为它们在非晶态和结晶态之间切换时具有相当独特的承受光学特性的突然，可重复和非易失性变化的能力，近年来，它们已经与超表面结构相结合，为实现动态可调性提供了有希望的平台。在本文中...