A nonlinear metasurface is demonstrated numerically based on the recently developed quantum-sized gold film. The active functionality of the metasurface is realized by varying the incident optical power through the ultrahigh Kerr nonlinearity of the quantum-sized gold films. In the low power region, the device acts as a normal reflecting surface, while it becomes a phase grating with most energy in the ±1 diffraction modes when the optical power increases and the nonlinear effect plays a dominating role. Unlike previously demonstrated nonlinear metasurfaces focusing on nonlinear frequency generation, the functionality of our device may be modulated by the power of incident light. As the first nonlinear metasurface that is based on optical Kerr nonlinearity, our design may lead to various applications, such as optical limiters and tunable phase gratings.

中文翻译：

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基于金量子阱的巨光学克尔响应的非线性超表面

基于最近开发的量子尺寸的金膜，通过数值论证了非线性的超颖表面。通过量子尺寸金膜的超高Kerr非线性来改变入射光焦度，可以实现超表面的主动功能。在低功率区域中，该器件充当法向反射面，而当光功率增加且非线性效应起主要作用时，该器件将成为在±1衍射模式下能量最多的相位光栅。与先前展示的专注于非线性频率生成的非线性超表面不同，我们设备的功能可以通过入射光的功率进行调制。作为第一个基于光学Kerr非线性的非线性超表面，我们的设计可能会导致各种应用，