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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 8 — Apr. 13, 2009
  • pp: 6230–6238

Whispering gallery mode carousel – a photonic mechanism for enhanced nanoparticle detection in biosensing

S. Arnold, D. Keng, S. I. Shopova, S. Holler, W. Zurawsky, and F. Vollmer  »View Author Affiliations

Optics Express, Vol. 17, Issue 8, pp. 6230-6238 (2009)

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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.

© 2009 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(040.1880) Detectors : Detection
(230.3990) Optical devices : Micro-optical devices

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: February 25, 2009
Revised Manuscript: March 31, 2009
Manuscript Accepted: March 31, 2009
Published: April 1, 2009

Virtual Issues
Vol. 4, Iss. 6 Virtual Journal for Biomedical Optics

S. Arnold, D. Keng, S. I. Shopova, S. Holler, W. Zurawsky, and F. Vollmer, "Whispering gallery mode carousel – a photonic mechanism for enhanced nanoparticle detection in biosensing," Opt. Express 17, 6230-6238 (2009)

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