![]() ![]() Recently developed geometric phase, namely Pancharatnam-Berry phase 1, derived from the photonic spin-orbit interaction 2, provides an integrated candidate for functional planar apparatuses 3– 5. Spatially curved surfaces or variant refractive indices are inevitable, resulting in a bulky size. Traditional optical elements rely on the phase accumulation along the propagation, known as the dynamic phase. Along with the miniaturization and integration of modern photonic technology, compact and multifunctional optical devices with active attributes are highly desired. Wavefront engineering of light lies in the heart of optics. This work offers a platform for advanced adaptive and multifunctional flat optics with merits of high compactness, low loss and broad bandwidth. The chirality inversion triggers facile switching of functionalities, such as beam steering, focusing/defocusing and spin-to-orbital angular momentum conversion. Their polychromatic working bands are reversibly tuned in an ultra-broadband over 1000 nm covering green to telecomm region. 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. 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. Corresponding elements usually suffer from static functions. The geometric phase derived from the photonic spin-orbit interaction provides an integrated strategy. Active planar optical devices that can dynamically manipulate light are highly sought after in modern optics and nanophotonics.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |