Metasurface lenses provide an ultrathin platform in which to focus light, but weak light–matter interactions limit their dynamic tunability. Here we design submicron-thick, ultrahigh quality factor (high-Q) metalenses that enable dynamic modulation of the focal length and intensity. Using full-field simulations, we show that quality factors exceeding 5000 can be generated by including subtle, periodic perturbations within the constituent Si nanoantennas. Such high-Q resonances enable lens modulation based on the nonlinear Kerr effect, with focal lengths varying from 4 to 6.5 μm and focal intensities decreasing by half as input intensity increases from 0.1 to 1 mW/μm². We also show how multiple high-Q resonances can be embedded in the lens response through judicious placement of the perturbations. Our high-Q lens design, with quality factors 2 orders of magnitude higher than existing lens designs, provides a foundation for reconfigurable, multiplexed, and hyperspectral metasurface imaging platforms.

中文翻译：

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使用高质量因子Metalenses进行动态聚焦。

超表面透镜提供了一个超薄的平台，可以在其中聚焦光线，但是弱的光线与物质的相互作用限制了它们的动态可调性。在这里，我们设计了亚微米级，超高品质因数（high- Q）的金属传感器，可以动态调节焦距和强度。使用全场模拟，我们表明，通过在组成的Si纳米天线中包含微妙的周期性扰动，可以生成超过5000的品质因数。这种高Q谐振使基于非线性克尔效应透镜调制，具有焦距可变的4至6.5微米和焦强度一半作为输入强度增加0.1至1毫瓦/微米减小²。我们还展示了高Q通过适当地放置摄动，共振可以嵌入晶状体反应中。我们的高Q透镜设计的质量系数比现有透镜设计高2个数量级，为可重构，多路复用和高光谱超表面成像平台奠定了基础。