Demonstration of mode splitting in an optical microcavity in aqueous environment

Woosung Kim, Ŝahin Kaya Özdemir, Jiangang Zhu, Lina He, Lan Yang

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Scatterer induced modal coupling and the consequent mode splitting in a whispering gallery mode resonator is demonstrated in aqueous environment. The rate of change in splitting as particles enter the resonator mode volume strongly depends on the concentration of particle solution. The higher is the concentration, the higher is the rate of change. Polystyrene nanoparticles of radius 50 nm with concentration as low as 5× 10-6 wt % have been detected using the mode splitting spectra. Observation of mode splitting in water paves the way for constructing advanced resonator based sensors for measuring nanoparticles and biomolecules in various environments.

Original languageEnglish (US)
Article number071111
JournalApplied Physics Letters
Issue number7
StatePublished - Aug 16 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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