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. 2017 Sep 8;7:11020. doi: 10.1038/s41598-017-11383-x

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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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Refractive index sensitivity measurement of gold thin film with gold cylindrical bumps greatly etched by RIE. (a) The resonance peak wavelength with saline water of different concentration (pure water, 1%, 5%, 10%, 15%, 20%, 25%). The inset depicts the transmission spectrum of deionized water and 25% saline water. The peak wavelength around 770 nm is red-shifted with increased refractive index from deionized water to 25% saline water. (b) The refractive index sensitivity fitting line of periodic nano-hole array perforated gold film using saline water, with the refractive index sensitivity of 416.6 ±1.3 nm/RIU with R-square = 0.97. Error bars represent the residual error, which is the difference between measured value and fitted value with the confidence coefficient of 0.95.