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. 2017 Nov 23;7:16186. doi: 10.1038/s41598-017-16501-3

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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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(a) The Fano resonance shift in the transmission spectra is shown for the cylinder pair (having the hole size of 0.6D ₀) with 0 wt% BTO (n = 1.6, k = 0.00376), when the environmental index, n _{environmental}, is changed. Fano resonances in hollow dielectric resonators are found to be very sensitive to index changes in the surrounding environment. (b) Resonance shift and FoM for the cylinder pair array as a function of environmental index. The resonance shift is almost linear, and the sensitivity S is about 10.566 GHz/RIU (RIU: refractive index unit). The sensitivity gradually increases with the inner hole size, as shown in Supplementary Fig. S4. (c) The Fano resonance shift in the transmission spectra is for the cylinder pair (having the hole size of 0.6D ₀) with 0 wt% BTO, when the index of the cylinder pair, n _material, is changed. The resonance shift is much smaller than that of the environmental index change in (a). (d) Resonance shift and FoM for the cylinder pair array as a function of material index. The sensitivity S is about 2.910 GHz/RIU.