Whispering gallery micro-global positioning system for nanoparticle sizing in real time

D. Keng, X. Tan, S. Arnold

Research output: Contribution to journalArticle

Abstract

We have devised a simple means for determining the size of a nanoparticle in one binding event (i.e., real time) by utilizing two polar modes of a slightly eccentric Whispering Gallery Mode (WGM) spheroidal resonator. The ratio of shifts of these modes locates the absolute latitude angle at which a nano-particle binds. From this location, the size of the nanoparticle is calculated using the reactive sensing principle. Although our latitude-only micro-global positioning scheme is applied to nanoparticle sizing using slightly eccentric spheroids in aqueous solution, this approach can be applied to WGM micro-resonators having a variety of shapes.

Original languageEnglish (US)
Article number071105
JournalApplied Physics Letters
Volume105
Issue number7
DOIs
StatePublished - Aug 18 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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