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. 2017 Oct 26;17(11):2452. doi: 10.3390/s17112452

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© 2017 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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Picture of the optical setup for exciting and detecting SPRs. A schematic of the components of the optical setup is shown in the inset (bottom right). Polychromatic light (L) reaches the polarizer (PS) after passing through two diaphragms (D1 and D2) and two mirrors (M1 and M2). By means of a third mirror (M3) and a prism (P), the polarized light reaches the sensor (mounted with a holder on top of the prism) and excites the surface plasmons (SPs). SPR is detected with a spectrometer (SMA) which collects the polarized light reflected from the sensor.