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9 June 2021 Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources
Zhiwei Guo, Yang Long, Haitao Jiang, Jie Ren, Hong Chen
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Abstract

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Zhiwei Guo, Yang Long, Haitao Jiang, Jie Ren, and Hong Chen "Anomalous unidirectional excitation of high-k hyperbolic modes using all-electric metasources," Advanced Photonics 3(3), 036001 (9 June 2021). https://doi.org/10.1117/1.AP.3.3.036001
Received: 10 March 2021; Accepted: 20 May 2021; Published: 9 June 2021
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CITATIONS
Cited by 59 scholarly publications.
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KEYWORDS
Waveguides

Near field

Wave propagation

Dispersion

Double positive medium

Near field optics

Circuit switching

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