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. 2016 Sep 7;6:32840. doi: 10.1038/srep32840

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Microscope images of metallic microsphere and reference bubble with varied spacing: (a) 1.39 μm, (b) 2.5 μm, (c) 3.3 μm, (d) 5.3 μm, (e) 8.4 μm, (f) 10.6 μm and (g) 20.7 μm. An example of the measurement lines (red coloured) fitted to the microsphere and bubble boundaries to estimate the spacing, is shown in (a). Microscope images of (h) ‘O’, (i) ‘E’, (j) ‘T’ formed by assembling the metallic microspheres in parallel via the OET device.