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. 2018 Mar 15;8:4642. doi: 10.1038/s41598-018-22895-5

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© The Author(s) 2018

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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Assessment of sensitivity of NAA-DBRs upon effective medium changes in non-apodized and apodized NAA-DBRs. (a) Representative RIfS spectra of a non-apodized NAA-DBR under different nanopores-infiltrating medium (i.e. air, ethanol, and water) (T_P = 1700 s, A_J = 0.420 mA cm⁻², J_min = J_offset = 0.280 mA cm⁻², t_STPA = 20 h, and t_pw = 4 min). (b) Representative RIfS spectra of a logarithmic negative apodized NAA-DBR under different nanopores-infiltrating medium (i.e. air, ethanol, and water) (T_P = 1700 s, ΔA_J = 0.210 mA cm⁻², J_min = J_offset = 0.280 mA cm⁻², t_ASTPA = 20 h, and t_pw = 4 min). (c) Bar chart showing the sensitivity in nm RIU⁻¹ of non-apodized NAA-DBRs produced at different T_P (1100, 1300, 1500, and 1700 s) and t_pw (0, 2, 4, and 6 min) (A_J = 0.420 mA cm⁻², J_min = J_offset = 0.280 mA cm⁻², and t_STPA = 20 h). (d) Bar chart showing the sensitivity in nm RIU⁻¹ of logarithmic negative apodized NAA-DBRs produced at different T_P (1100, 1300, 1500, and 1700 s) and t_pw (0, 2, 4, and 6 min) (ΔA_J = 0.210 mA cm⁻², J_min = J_offset = 0.280 mA cm⁻², and t_ASTPA = 20 h).