Enhanced Nanoparticle Detection with Liquid Droplet Resonators
Loading...
Authors
Foreman, M.R.
Avino, Saverio
Zullo, Rosa
Loock, Hans-Peter
Vollmer, F.
Gagliardi, G.
Date
2016-02-25
Type
journal article
Language
en
Keyword
Nanoparticle Detection , Liquid Droplet Resonators
Alternative Title
Abstract
Whispering gallery mode particle sensing experiments are commonly performed with solid resonators, whereby the sensing volume is limited to the weak evanescent tail of the mode near the resonator surface. In this work we discuss in detail the sensitivity enhancements achievable in liquid droplet resonators wherein the stronger internal fields and convenient means of particle delivery can be exploited. Asymptotic formulae are derived for the relative resonance shift, line broadening and mode splitting of TE and TM modes in liquid droplet resonators. As a corollary the relative fraction of internal and external mode energy follows, which is shown to govern achievable sensitivity enhancements of solute concentration measurements in droplet sensors. Experimental measurements of nanoparticle concentration based on whispering gallery mode resonance broadening are also presented.
Description
Citation
Publisher
License
Journal
Volume
Issue
URI for this record
PubMed ID
External DOI
ISSN
1951-6355 (print)
1951-6401 (online)
1951-6401 (online)