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. 2020 Jun 30;10(7):1289. doi: 10.3390/nano10071289

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Goos–Hänchen (GH)-SPR signal changes enhanced by four different types of 2D perovskites ranging from (a) MAPbI₃, (b) MAPbBr₃, (c) MAPbI_3−xCl_x to (d) FAPbI₃, which are respectively tuned by different silver substrate thickness. The refractive index change for the targeted sample solutions is fixed to a narrow change of 10⁻⁶ RIU.