Chirality invertible superstructure mediated active planar optics
Chirality invertible superstructure mediated active planar optics
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DOI：
10.1038/s41467-019-10538-w
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发表时间：
2019-06-07
影响因子：
16.6
通讯作者：
Lu, Yan-Qing
中科院分区：
文献类型：
--
作者：
Chen, Peng;Ma, Ling-Ling;Lu, Yan-Qing
能够动态操纵光的有源平面光学器件在现代光学和纳米光子学领域备受追捧。光子自旋轨道相互作用的几何相位提供了一种综合策略。相应的元素通常受到静态函数的影响。本文引入一种具有光可逆手性上部结构的非均匀自组织各向异性介质，实现了工作光谱连续可调、相轮廓光翻转的几何相元。通过预先编程胆甾液晶与光响应性手性掺杂剂的排列，我们展示了光激活偏转器、透镜、艾里光束和光学涡旋发生器。它们的多色工作频带在1000 nm以上的超宽带中可逆调谐，覆盖绿色到电信区域。手性反转触发了功能的切换，如光束转向、聚焦/散焦和自旋到轨道的角动量转换。这项工作为具有高紧凑、低损耗和宽带宽等优点的先进自适应多功能平面光学提供了一个平台。
Active planar optical devices that can dynamically manipulate light are highly sought after in modern optics and nanophotonics. The geometric phase derived from the photonic spin-orbit interaction provides an integrated strategy. Corresponding elements usually suffer from static functions. Here, we introduce an inhomogeneously self-organized anisotropic medium featured by photo-invertible chiral superstructure to realize geometric phase elements with continuously tunable working spectrum and light-flipped phase profile. Via preprograming the alignment of a cholesteric liquid crystal mixed with a photo-responsive chiral dopant, we demonstrate light-activated deflector, lens, Airy beam and optical vortex generators. Their polychromatic working bands are reversibly tuned in an ultra-broadband over 1000 nm covering green to telecomm region. The chirality inversion triggers facile switching of functionalities, such as beam steering, focusing/defocusing and spin-to-orbital angular momentum conversion. This work offers a platform for advanced adaptive and multi-functional flat optics with merits of high compactness, low loss and broad bandwidth.