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. 2017 Jun 6;7:2833. doi: 10.1038/s41598-017-02839-1

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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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(a) Schematic of a different surface / NW contributions for different frequencies: at the lowest 27 Hz the PA signal mainly originates from Si substrate, while at the highest 225 Hz it mainly originates from NW absorption. (b) PA spectra for three different frequencies that correspond to the different contribution of the sample surface for sample B. At the highest frequency 225 Hz we observe the resonant peak corresponding to the excitation of HE11 mode.