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. 2010 Jun 22;10(6):6257–6274. doi: 10.3390/s100606257

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© 2010 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 1. — Illustration of the origin of cavity mode shifts in a WGM resonator upon biomolecular adsorption: (a) Effect of resonator size increase due to an adsorbate layer on whispering gallery mode (WGM) formation; (b) WGM wavelength shift due to formation of the adsorbate layer; (c) Definition of the two states of polarization for WGMs: k⃗—wave vector, E⃗—electric field, H⃗—magnetic field, n_s—refractive index of the resonator, n_e—refractive index of the environment.