alexa Interferometric detection of mode splitting for whispering gallery mode biosensors
Engineering

Engineering

Biosensors Journal

Author(s): Joachim Knittel, Terry G McRae, Kwan H Lee, Warwick P Bowen

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Sensors based on whispering gallery moderesonators can detect single nanoparticles and even single molecules. Particles attaching to the resonator induce a doublet in the transmission spectrum which provides a self-referenced detection signal. However, in practice this spectral feature is often obscured by the width of the resonance line which hides the doublet structure. This happens particularly in liquid environments that reduce the effective Q factor of the resonator. In this paper we demonstrate an interferometric setup that allows the direct detection of the hidden doublet and thus provides a pathway for developing practical sensor applications.

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This article was published in Applied Physics Letters and referenced in Biosensors Journal

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