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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 2 — Feb. 1, 2013
  • pp: 338–348

Influence of high-refractive-index oxide coating on optical properties of metal nanoparticles

Katri Laaksonen, Samu Suomela, Sakari R. Puisto, Niko K. J. Rostedt, Tapio Ala-Nissila, and Risto M. Nieminen  »View Author Affiliations


JOSA B, Vol. 30, Issue 2, pp. 338-348 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000338


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Abstract

The localized surface-plasmon resonance absorption of metal nanoparticles is currently utilized in many fields such as near-infrared (NIR) curing and biomedical applications. In this paper, we study theoretically the influence of an oxide (SiO2, ZrO2, or TiO2) shell on a metal (Ag, Au, or Cu) nanoparticle from the point of view of shifting the resonance peak to a more desirable color or NIR wavelengths while conserving the intensity of the absorption or extinction peak. The computational models used in the studies include the Mie theory and the four-flux method. We find shifts of up to hundreds or even close to 1000 nm. Among the material combinations studied, the largest shifts are obtained with Ag-TiO2 core-shell nanoparticles when going from a few nanometers sized core without an oxide shell to a 100 nm size core with a 100 nm thick shell. However, the huge shifts happen together with severe intensity loss of the absorption peak, leading to a more conservative estimate of practically useful shifts of a few hundreds of nanometers.

© 2013 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(160.4236) Materials : Nanomaterials

ToC Category:
Materials

History
Original Manuscript: August 15, 2012
Revised Manuscript: November 7, 2012
Manuscript Accepted: December 2, 2012
Published: January 14, 2013

Citation
Katri Laaksonen, Samu Suomela, Sakari R. Puisto, Niko K. J. Rostedt, Tapio Ala-Nissila, and Risto M. Nieminen, "Influence of high-refractive-index oxide coating on optical properties of metal nanoparticles," J. Opt. Soc. Am. B 30, 338-348 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-2-338


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