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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 17563–17574

Imaging the uptake of gold nanoshells in live cells using plasmon resonance enhanced four wave mixing microscopy

Natalie Garrett, Matt Whiteman, and Julian Moger  »View Author Affiliations


Optics Express, Vol. 19, Issue 18, pp. 17563-17574 (2011)
http://dx.doi.org/10.1364/OE.19.017563


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Abstract

Gold nanoshells (GNS) are novel metal nanoparticles exhibiting attractive optical properties which make them highly suitable for biophotonics applications. We present a novel investigation using plasmon-enhanced four wave mixing microscopy combined with coherent anti-Stokes Raman scattering (CARS) microscopy to visualize the distribution of 75 nm radius GNS within live cells. During a laser tolerance study we found that cells containing nanoshells could be exposed to < 2.5 mJ each with no photo-thermally induced necrosis detected, while cell death was linearly proportional to the power over this threshold. The majority of the GNS signal detected was from plasmon-enhanced four wave mixing (FWM) that we detected in the epi-direction with the incident lasers tuned to the silent region of the Raman spectrum. The cellular GNS distribution was visualized by combining the epi-detected signal with forwards-detected CARS at the CH2 resonance. The applicability of this technique to real-world nanoparticle dosing problems was demonstrated in a study of the effect of H2S on nanoshell uptake using two donor molecules, NaHS and GYY4137. As GYY4137 concentration was increased from 10 µM to 1 mM, the nanoshell pixel percentage as a function of cell volume (PPCV) increased from 2.15% to 3.77%. As NaHS concentration was increased over the same range, the nanoshell PPCV decreased from 12.67% to 11.47%. The most important factor affecting uptake in this study was found to be the rate of H2S release, with rapid-release from NaHS resulting in significantly greater uptake.

© 2011 OSA

OCIS Codes
(170.1530) Medical optics and biotechnology : Cell analysis
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(160.4236) Materials : Nanomaterials
(180.4315) Microscopy : Nonlinear microscopy

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: July 5, 2011
Revised Manuscript: August 18, 2011
Manuscript Accepted: August 19, 2011
Published: August 22, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Natalie Garrett, Matt Whiteman, and Julian Moger, "Imaging the uptake of gold nanoshells in live cells using plasmon resonance enhanced four wave mixing microscopy," Opt. Express 19, 17563-17574 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-18-17563


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