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. 2019 Dec 30;9:20338. doi: 10.1038/s41598-019-56692-5

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© The Author(s) 2019

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) Resonant wavelength shift as a function of the applied voltage for a voltage range from 0 to 1.2 V. (b) Resonant wavelength shift as a function of the applied voltage for a voltage range from 0 to 0.6 V. (c) Resonant wavelength peak position as a function of applied voltage illustrating linear and steep resonant peak shifts for voltages higher than 0.8 V. (d) The corresponding quality factor of the resonant wavelength peaks as a function of the applied voltage.