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versatile on-chip light coupling and(de)multiplexing from arbitrary polarizations to controlled waveguide modes using an integrated dielectric metasurface

引用

Photonics Research 2020年第4期8卷 564-576页

作者： YUAN MENG ZHOUTIAN LIU ZHENWEI XIE RIDE WANG TIANCHENG QI FUTAI HU HYUNSEOK KIM QIRONG XIAO XING FU QIANG WU SANG-HOON BAE MALI GONG XIAOCONG YUAN State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua UniversityBeijing 100084China Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Weak-light Nonlinear Photonics Ministry of EducationTEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

Metasurfaces have found broad applicability in free-space optics,while its potential to tailor guided waves remains barely *** synergizing the Jones matrix model with generalized Snell’s law under the phase-matching condition,we propose a universal design strategy for versatile on-chip mode-selective coupling with polarization sensitivity,multiple working wavelengths,and high efficiency *** coupling direction,operation frequency,and excited mode type can be designed at will for arbitrary incident polarizations,outperforming previous technology that only works for specific polarizations and lacks versatile mode ***,using silicon-nanoantenna-patterned silicon-nitride photonic waveguides,we numerically demonstrate a set of chip-scale optical couplers around 1.55μm,including mode-selective directional couplers with high coupling efficiency over 57%and directivity about 23 d *** and wavelength demultiplexer scenarios are also proposed with 67%maximum efficiency and an extinction ratio of 20 d ***,a chip-integrated twisted light generator,coupling free-space linear polarization into an optical vortex carrying 1 h orbital angular momentum(OAM),is also reported to validate the mode-control *** comprehensive method may motivate compact wavelength/polarization(de)multiplexers,multifunctional mode converters,on-chip OAM generators for photonic integrated circuits,and high-speed optical telecommunications.

关键词： versatile on-chip light arbitrary polarizations waveguide modes an integrated dielectric metasurface

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