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Schematics of the experimental setup. Micropipette is used to inject nanoparticles into the microaquarium.
Transmission spectra obtained for a microtoroid during the measurements in (a) air and (b) water before nanoparticle injection and (c) in water after nanoparticle injection. The doublet in (c) is the manifestation of mode splitting.
A series of transmission spectra obtained for consecutive depositions of nanoparticles (PS, ) into the resonator mode volume for particle concentrations of (left) and (right).
Effect of concentration on the amount of mode splitting for PS particles of at concentrations (1) , (2) , (3) , and (4) in (a). Enlarged plots of the results in (1) and (4) are depicted, respectively, in (b) and (c). Nonzero at zero-time (before the injection of PS particles) of (3) is due to intrinsic mode splitting which is caused by scattering centers formed due to surface inhomogeneity and contaminations.
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