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. 2018 Aug 26;8(3):80. doi: 10.3390/bios8030080

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© 2018 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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Optical configuration of incident light in SPR sensor apparatus in Kretschmann configuration. (a) Convergent, (b) divergent, (c) rotating for incident angle scanning.