基于迂回相位的色散补偿元全息图
Dispersion-compensated meta-holograms based on detour phase
摘要：
亚波长结构化表面，称为超颖表面，为未来具有多功能的紧凑和光学薄器件提供了希望。在此，我们在第一个计算机生成全息图的基础上重新审视迂回相位的概念，设计了具有新功能的高性能透射介质元全息图。在一类这样的器件中，通过用亚波长结构的色散补偿迂回相位的固有色散，已经产生了与波长无关的相位掩模。这导致从可见光到近红外的宽带操作，在1000至1400 nm范围内效率高达75%。我们还表明，我们可以完全控制成像光学系统的有效焦距，通过在元全息图中加入类似透镜的功能。在第二类设备中，我们已经在相位图中纳入了几何相位，以首次实现手性成像：不同图像的投影取决于参考光束的手性。我们设备的紧凑性、重量轻和即使在大角度下也能产生图像的能力对于可穿戴光学等重要的新兴应用具有巨大的潜力。
英文摘要：
Subwavelength structured surfaces, known as metasurfaces, hold promise for future compact and optically thin devices with versatile functionalities. Here, by revisiting the concept of detour phase at the basis of the first computer generated holograms we have designed high-performance transmissive dielectric meta-holograms with new functionalities. In one class of such devices wavelength- independent phase masks have been generated by compensating the inherent dispersion of the detour phase with that of the subwavelength structures. This leads to broadband operation from the visible to the near infrared with efficiency as high as 75% in the 1000 to 1400 nm range. We have also shown that we can fully control the effective focal length of the imaging optical system by incorporating a lens-like function in the meta-hologram. In a second class of devices we have incorporated in the phase map a geometric phase to achieve for the first time chiral imaging: the projection of different images depends on the handedness of the reference beam. The compactness, lightweight and ability to produce images even at large angles of our devices have significant potential for important emerging applications such as wearable optics.
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