论文标题
用非局部平面光学器件挤压空间
Squeeze free space with nonlocal flat optics
论文作者
论文摘要
通过平面光学元件将光学系统化的微型化系统引起了极大的兴趣。但是，从根本上讲，一个必需的光学组件，自由空间不能用具有空间依赖性传输函数的常规局部平面光学元件代替，因为自由空间的传输函数是动量依赖性的。克服这一困难对于实现光学系统的最大小型化非常重要。在这项工作中，我们表明可以用直接在动量域中运行的非局部平面光学器件代替自由空间。我们得出了一个光学设备的一般标准，以取代自由空间，并提供光子晶体平板设备的具体设计。这样的设备可以用高达144的压缩比替代更厚的自由空间。我们的工作为使用局部和非局部平面光学元组合组合使用光学系统的最大化铺平了道路。
There has been substantial interest in miniaturizing optical systems by flat optics. However, one essential optical component, free space, fundamentally cannot be substituted with conventional local flat optics with space-dependent transfer functions, since the transfer function of free space is momentum-dependent instead. Overcoming this difficulty is important to achieve utmost miniaturization of optical systems. In this work, we show that free space can be substituted with nonlocal flat optics operating directly in the momentum domain. We derive the general criteria for an optical device to replace free space, and provide a concrete design of a photonic crystal slab device. Such a device can substitute much thicker free space with a compression ratio as high as 144. Our work paves the way for utmost miniaturization of optical systems using combination of local and nonlocal flat optics.
