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Sensors based on whispering gallery mode resonators can detect singlenanoparticles and even single molecules. Particles attaching to the resonatorinduce a doublet in the transmission spectrum which provides a self-referenceddetection signal. However, in practice this spectral feature is often obscuredby the width of the resonance line which hides the doublet structure. Thishappens particularly in liquid environments that reduce the effective Q factorof the resonator. In this paper we demonstrate an interferometric set-up thatallows the direct detection of the hidden doublet and thus provides a pathwayfor developing practical sensor applications.

Interferometric detection of mode splitting for whispering gallery mode biosensors