We demonstrated a biosensing approach which, for the first time, combines the high sensitivity of whispering gallery modes (WGMs) with a metallic nanoparticle-based assay. We provided a computational model based on generalized Mie theory to explain the higher sensitivity of protein detection. We quantitatively analyzed the binding of a model protein (i.e., Bovine Serum Albumin) to gold nanoparticles from high-Q WGM resonance frequency shifts, and fit the results to an adsorption isotherm, which agrees with the theoretical predictions of a two-component adsorption model.
Nanoparticle-based protein detection by optical shift of a resonant microcavity
Miguel A. Santiago-Cordoba, Svetlana V. Boriskina, Frank Vollmer, Melik C. Demirel; Nanoparticle-based protein detection by optical shift of a resonant microcavity. Appl. Phys. Lett. 15 August 2011; 99 (7): 073701. https://doi.org/10.1063/1.3599706
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