Observation and characterization of mode splitting in microsphere resonators in aquatic environment

Details Observation and characterization of mode splitting in microsphere resonators in aquatic environment Observation and characterization of mode splitting in microsphere resonators in aquatic environment

2011-03-11

arxiv.org/abs/1103.2398v1

Appl. Phys. Lett. 98, 141106 (2011)

Physics

Optics

4 Pages, 5 Figures, 13 References

Scientific paper

10.1063/1.3571555

Whispering gallery mode (WGM) optical resonators utilizing resonance shift (RS) and mode splitting (MS) techniques have emerged as highly sensitive platforms for label-free detection of nano-scale objects. RS method has been demonstrated in various resonators in air and liquid. MS in microsphere resonators has not been achieved in aqueous environment up to date, despite its demonstration in microtoroid resonators. Here, we demonstrate scatterer-induced MS of WGMs in microsphere resonators in water. We determine the size range of particles that induces MS in a microsphere in water as a function of resonator mode volume and quality factor. The results are confirmed by the experimental observations.

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