用非局部平面光学压缩自由空间
Squeeze free space with nonlocal flat optics
摘要：
人们对通过平面光学器件使光学系统小型化产生了浓厚的兴趣。然而，一个基本的光学组件，自由空间，根本上不能用传统的局部平面光学与空间相关的传递函数取代，因为自由空间的传递函数是动量相关的。克服这个困难对于实现光学系统的最大小型化是重要的。在这项工作中，我们表明，自由空间可以取代直接在动量域中操作的非局部平面光学。推导了光学器件取代自由空间的一般判据，并给出了一个光子晶体平板器件的具体设计。这种装置可以用高达144的压缩比来代替厚得多的自由空间。我们的工作铺平了道路，最大限度地利用本地和非本地平面光学组合的光学系统的小型化。
英文摘要：
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.
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