Tunable plasmon-phonon polaritons in anisotropic 2D materials on hexagonal boron nitride

Nanophotonics

article

Hodjat Hajian¹  Ekmel Ozbay¹  Ivan D. Rukhlenko⁴  George W. Hanson⁶  Tony Low⁷  Bayram Butun¹ 

[1] NANOTAM-Nanotechnology Research Center, Bilkent University;Department of Electrical and Electronics Engineering, Bilkent University;Department of Physics and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University;Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney;Information Optical Technologies Centre, ITMO University;Department of Electrical Engineering, University of Wisconsin;Department of Electrical and Computer Engineering, University of Minnesota

关键词: 2D materials;    hexagonal boron nitride;    hyperbolic;    in-plane anisotropy;    polaritons;    topology;   

DOI  :  10.1515/nanoph-2020-0080

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 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.

【 授权许可】

CC BY