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. 2017 Oct 13;7:13168. doi: 10.1038/s41598-017-13205-6

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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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The fiber based detection combined with the inclined dual fiber optical tweezers for cell mechanics study. (a) A trapped bead was moved to a selected location on the cell surface with no external force applied. The bead was held in place to be spontaneously bonded to the cell surface. (b) The bead was moved in the y direction by displacing the inclined dual fiber optical tweezers to apply an external force to the cell membrane. (c–f) Power spectrum data of the bead. Raw data (c) obtained with the fiber based detection in the y axis were blocked and fitted (d) by a Lorentzian. Raw data (e) obtained with a PSD though an objective lens were blocked (f) but cannot be fitted by a Lorentzian. Inset in (d): schematics showing back-scattered signal collected by the fibers without optical scattering and distortion by cells; Inset in (f): schematics showing the optical distortion and scattering by cells in the transmission light detected by the objective and PSD.