Song Q, Khadir S, Vézian S, Damilano B, Mierry P D, Chenot S, Brandli V, Genevet P
Université Cote d'Azur, CNRS, CRHEA, Rue Bernard Gregory, Sophia Antipolis, 06560 Valbonne, France.
Sci Adv. 2021 Jan 29;7(5). doi: 10.1126/sciadv.abe1112. Print 2021 Jan.
Any arbitrary state of polarization of light beam can be decomposed into a linear superposition of two orthogonal oscillations, each of which has a specific amplitude of the electric field. The dispersive nature of diffractive and refractive optical components generally affects these amplitude responses over a small wavelength range, tumbling the light polarization properties. Although recent works suggest the realization of broadband nanophotonic interfaces that can mitigate frequency dispersion, their usage for arbitrary polarization control remains elusively chromatic. Here, we present a general method to address broadband full-polarization properties of diffracted fields using an original superposition of circular polarization beams transmitted through metasurfaces. The polarization-maintaining metasurfaces are applied for complex broadband wavefront shaping, including beam deflectors and white-light holograms. Eliminating chromatic dispersion and dispersive polarization response of conventional diffractive elements lead to broadband polarization-maintaining devices of interest for applications in polarization imaging, broadband-polarimetry, augmented/virtual reality imaging, full color display, etc.
光束的任何任意偏振态都可以分解为两个正交振荡的线性叠加，其中每个振荡都具有特定的电场振幅。衍射和折射光学元件的色散特性通常会在小波长范围内影响这些振幅响应，从而扰乱光的偏振特性。尽管最近的研究表明可以实现能够减轻频率色散的宽带纳米光子界面，但它们在任意偏振控制方面的应用仍然难以避免色度问题。在这里，我们提出了一种通用方法，通过使用透过超表面传输的圆偏振光束的原始叠加来解决衍射场的宽带全偏振特性。保偏超表面被应用于复杂的宽带波前整形，包括光束偏转器和白光全息图。消除传统衍射元件的色散和色散偏振响应会产生适用于偏振成像、宽带偏振测量、增强/虚拟现实成像、全彩色显示等应用的宽带保偏器件。
