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

Woosung Kim, Şahin Kaya Özdemir, Jiangang Zhu, Lan Yang

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

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 nanoscale 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.

Original languageEnglish (US)
Article number141106
JournalApplied Physics Letters
Volume98
Issue number14
DOIs
StatePublished - Apr 4 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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