Microbubble whispering gallery mode resonator as an all-optical platform for the characterisation of photoacoustics contrast agents.

Frigenti G., Cavigli L., Fernandez-Bienes A., Ratto F., Centi S., Garcia-Fernandez T., Nunzi Conti G., Righini G., Soria S.

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We present the implementation of a microbubble whispering gallery mode (WGM) resonator in an all-optical photoacoustic (PA) experiment, showing the potential of these resonators as ultrasound transducers for the characterisation of PA contrast agents. In the chosen configuration the detection of the PA shockwave from metallic nanoparticles (NP) is achieved by monitoring the shift of a WGM resonance of the microbubble when a colloidal solution of NP is run inside the microbubble, taking advantage of the microbubble mechanical resonances to enhance the transduction mechanism. The characterisation of PA contrast agents is proved by measuring the photostability of Golden NanoRods.

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