Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-10538-w
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Funding
- National Key Research and Development Program of China [2017YFA0303700]
- National Natural Science Foundation of China (NSFC) [61575093, 61490714, 61435008]
- Distinguished Young Scholars Fund of Jiangsu Province [BK20180004]
- Fundamental Research Funds for the Central Universities [021014380118]
- Scientific Research Foundation of Graduate School of Nanjing University [2017ZDL06]
- Tang Scholar program
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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.
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