Near-field probing of image phonon-polaritons in hexagonal boron nitride on gold crystals

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Near-field mapping has been widely used to study hyperbolic phonon-polaritons in van der Waals crystals. However, an accurate measurement of the polaritonic loss remains challenging because of the inherent complexity of the near-field signal and the substrate-mediated loss. Here we demonstrate that large-area monocrystalline gold flakes, an atomically flat low-loss substrate for image polaritons, provide a platform for precise near-field measurement of the complex propagation constant of polaritons in van der Waals crystals. As a topical example, we measure propagation loss of the image phonon-polaritons in hexagonal boron nitride, revealing that their normalized propagation length exhibits a parabolic spectral dependency. Furthermore, we show that image phononpolaritons exhibit up to a twice longer normalized propagation length, while being 2.4 times more compressed compared to the case of the dielectric substrate. We conclude that the monocrystalline gold flakes provide a unique nanophotonic platform for probing and exploitation of the image modes in low-dimensional materials.
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Issue Date
2022-07
Language
English
Article Type
Article
Citation

SCIENCE ADVANCES, v.8, no.28

ISSN
2375-2548
DOI
10.1126/sciadv.abn0627
URI
http://hdl.handle.net/10203/297484
Appears in Collection
EE-Journal Papers(저널논문)
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