文章基本信息

标题：Tunable plasmon-phonon polaritons in anisotropic 2D materials on hexagonal boron nitride
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作者：Hodjat Hajian ; Ivan D. Rukhlenko ; George W. Hanson 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2020
卷号：-1
期号：ahead-of-print
页码：3909-3920
DOI：10.1515/nanoph-2020-0080
出版社：Walter de Gruyter GmbH
摘要：Mid-infrared (MIR) plasmon-phonon features of heterostructures composing of a plasmonic anisotropic two-dimensional material (A2DM) on a hexagonal boron nitride (hBN) film are analyzed. We derive the exact dispersion relations of plasmon-phonons supported by the heterostructures and demonstrate the possibility of topological transitions of these modes within the second Reststrahlen band of hBN. The topological transitions lead to enhanced local density of plasmon-phonon states, which intensifies the spontaneous emission rate, if the thickness of the hBN layer is appropriately chosen. We also investigate a lateral junction formed by A2DM/hBN and A2DM, demonstrating that one can realize asymmetric guiding, beaming, and unidirectionality of the hybrid guided modes. Our findings demonstrate potential capabilities of the A2DM/hBN heterostructures for active tunable light–matter interactions and asymmetric in-plane polariton nanophotonics in the MIR range.
关键词：2D materials ; hexagonal boron nitride ; hyperbolic ; in-plane anisotropy ; polaritons ; topology