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Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum

Light(Science & Applications) 2017年第1期6卷 129-135页

作者： Kun Huang Hong Liu Sara Restuccia Muhammad Q Mehmood Sheng-Tao Mei daniel giovannini AaronDanner Miles J Padgett Jing-Hua Teng Cheng-Wei Qiu Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore 138634Singapore Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China SUPA School of Physics and AstronomyUniversity of GlasgowGlasgow G128QQUK Information Technology University of the Punjab Lahore 54000Pakistan NUS Graduate School for Integrative Science and Engineering National University of SingaporeSingapore 117456Singapore The Edward S Rogers Department of Electrical and Computer Engineering University of TorontoToronto M5S 3G4Canada SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen UniversityShenzhen 518060China NUS Suzhou Research Institute(NUSRI) Suzhou 215123China

Quantum entanglements between integer-order and fractional-order orbital angular momentums(OAMs)have been previously ***,the entangled nature of arbitrary rational-order OAM has long been considered a myth due to the absence of an effective strategy for generating arbitrary rational-order OAM ***,we report a single metadevice comprising a bilaterally symmetric grating with an aperture,creating optical beams with dynamically controllable OAM values that are continuously varying over a rational *** to its encoded spiniform phase,this novel metagrating enables the production of an average OAM that can be increased without a theoretical limit by embracing distributed singularities,which differs significantly from the classic method of stacking phase singularities using fork *** new method makes it possible to probe the unexplored niche of quantum entanglement between arbitrarily defined OAMs in light,which could lead to the complex manipulation of microparticles,high-dimensional quantum entanglement and optical *** show that quantum coincidence based on rational-order OAM-superposition states could give rise to low cross-talks between two different states that have no significant overlap in their spiral ***,future applications in quantum communication and optical micromanipulation may be found.

关键词： metasurface nanophotonics orbital angular momentum superposition state

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