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. 2017 Sep 11;8:514. doi: 10.1038/s41467-017-00602-8

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© The Author(s) 2017

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 — Sets and electric field distribution of the employed microwave cavity. a Schematic of example resonant traces showing the sample induced changes of microwave resonant cavity, which presents a shift in frequency and the change of bandwidth. b Quarter section of the perturbation cavity, cut to show the location of the sample tube (inner diameter 2 mm). c Exterior look of the microwave cavity. d Plan, e side and f slant views of the electric field distribution in the employed microwave resonant cavity