Whispering Gallery Mode Carousel - A photonic mechanism for enhanced nanoparticle detection In biosensing

S. Arnold, D. Keng, S. I. Shopova, S. Holler, W. Zurawsky, F. Vollmer

Research output: Contribution to journalArticlepeer-review

Abstract

Individual nanoparticles in aqueous solution are observed to be attracted to and orbit within the evanescent sensing ring of a Whispering Gallery Mode micro-sensor with only microwatts of driving power. This Carousel trap, caused by attractive optical gradient forces, interfacial interactions, and the circulating momentum flux, considerably enhances the rate of transport to the sensing region, thereby overcoming limitations posed by diffusion on such small area detectors. Resonance frequency fluctuations, caused by the radial Brownian motion of the nanoparticle, reveal the radial trapping potential and the nanoparticle size. Since the attractive forces draw particles to the highest evanescent intensity at the surface, binding steps are found to be uniform.

Original languageEnglish (US)
Pages (from-to)6230-6238
Number of pages9
JournalOptics Express
Volume17
Issue number8
DOIs
StatePublished - Apr 13 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Whispering Gallery Mode Carousel - A photonic mechanism for enhanced nanoparticle detection In biosensing'. Together they form a unique fingerprint.

Cite this