The unidirectional excitation of near-field optical modes is a fundamental prerequisite for many photonic applications,such as wireless power transfer and information communications.We experimentally construct all-ele...The unidirectional excitation of near-field optical modes is a fundamental prerequisite for many photonic applications,such as wireless power transfer and information communications.We experimentally construct all-electric Huygens and spin metasources and demonstrate anomalous unidirectional excitation of high-k hyperbolic modes in two types of hyperbolic metasurfaces.We use a Huygens metasource to study the unidirectional excitation of hyperbolic bulk modes in a planar hyperbolic metamaterial(HMM).Specifically,unidirectional excitation is the same as that in free space in the vertical direction,but opposite to that in free space in the horizontal direction.This anomalous unidirectional excitation is determined by the anisotropic HMM dispersion.In addition,we use a spin metasource to observe the anomalous photonic spin Hall effect in a planar hyperbolic waveguide.For a near-field source with a specific spin,the guide mode with a fixed directional wave vector is excited due to spin-momentum locking.Because the directions of momentum and energy flows in the HMM waveguide are opposite,the unidirectional excitation of hyperbolic guided modes is reversed.Our results not only uncover the sophisticated electromagnetic functionalities of metasources in the near-field but may also provide novel opportunities for the development of integrated optical devices.展开更多
基金This work was supported by the National Key R&D Program of China(Grant No.2016YFA0301101)the National Natural Science Foundation of China(NSFC)(Grant Nos.12004284,11775159,61621001,and 11935010)+3 种基金the Natural Science Foundation of Shanghai(Grant Nos.18ZR1442800 and 18JC1410900)China Postdoctoral Science Foundation(Grant Nos.2019TQ0232 and 2019M661605)the Shanghai Super Postdoctoral Incentive Programand the Opening Project of Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology.The authors declare no conflicts of interest.
文摘The unidirectional excitation of near-field optical modes is a fundamental prerequisite for many photonic applications,such as wireless power transfer and information communications.We experimentally construct all-electric Huygens and spin metasources and demonstrate anomalous unidirectional excitation of high-k hyperbolic modes in two types of hyperbolic metasurfaces.We use a Huygens metasource to study the unidirectional excitation of hyperbolic bulk modes in a planar hyperbolic metamaterial(HMM).Specifically,unidirectional excitation is the same as that in free space in the vertical direction,but opposite to that in free space in the horizontal direction.This anomalous unidirectional excitation is determined by the anisotropic HMM dispersion.In addition,we use a spin metasource to observe the anomalous photonic spin Hall effect in a planar hyperbolic waveguide.For a near-field source with a specific spin,the guide mode with a fixed directional wave vector is excited due to spin-momentum locking.Because the directions of momentum and energy flows in the HMM waveguide are opposite,the unidirectional excitation of hyperbolic guided modes is reversed.Our results not only uncover the sophisticated electromagnetic functionalities of metasources in the near-field but may also provide novel opportunities for the development of integrated optical devices.
