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. 2021 Apr 15;10:84. doi: 10.1038/s41377-021-00524-7

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© The Author(s) 2021

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. 1 — a Topography image (1 μm × 1 μm). b Corresponding broadband infrared near-field image, with the reference mirror fixed at position d ≈ 0. Positions A and B indicate the regions of IG and GB, respectively. c One-dimensional near-field amplitude and the topography line profiles along the black dashed lines in a and b. The optical signal intensity was recorded by the mercury-cadmium-telluride (MCT) detector so that signal in the unit of V was used. The scale bars in a and b are 200 nm