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. 2020 Nov 30;11:6086. doi: 10.1038/s41467-020-19913-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Real-space imaging of edge-tailored PhPs in rotated square nanocavities (side length: 4 μm; thickness: d = 175 nm) which was fabricated in the same piece of α-MoO₃ sample. b–e Nano-FTIR spectral line scans perpendicular to the rotated edges (white dotted lines in Sq1–Sq4), showing the near-field amplitude s₂(ω) (normalized to the near-field amplitude on the SiO₂ substrate, s_2,SiO2(ω)) as a function of distance between tip and edge. Color dashed lines are guides for the eye of signal maxima. f Dispersion relation of hyperbolic PhPs in square α-MoO₃ nanocavities. The red, blue, cyan and pink line corresponds to the theoretical dispersions at different rotation angles θ = 0°, 15°, 30°, and 45° respectively. The squares correspond to the experimentally measured data.