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. 2013 Jan 7;13(1):721–735. doi: 10.3390/s130100721

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 7. — Refractive index as a function of the plasmon resonance wavelength. (a) Configurations with a 1,000 μm diameter POF. (b) Configurations with a 250 μm diameter POF.