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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 534–546

Tuning surface plasmons in interconnected hemispherical Au shells

Peter Krohne-Nielsen, Sergey M. Novikov, Jonas Beermann, Per Morgen, Sergey I. Bozhevolnyi, and Ole Albrektsen  »View Author Affiliations


Optics Express, Vol. 20, Issue 1, pp. 534-546 (2012)
http://dx.doi.org/10.1364/OE.20.000534


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Abstract

We present a new approach for making interconnected hemispherical shells by stripping Au from templates of anodized aluminum, where the metal thickness can be adjusted without affecting the outer radius of curvature, film roughness and the sharpness of the hemisphere contact areas. This provides increased understanding of the surface plasmon resonances (SPRs) observed for Film-On-Nanospheres (FONs) by decoupling these parameters, which are coupled in the case of FONs. Investigating the influence of the shell thicknesses on the spectral positions of SPRs for FONs involves a dielectric core with a fixed radius encased by a metal film with adjustable thickness. By performing linear reflection spectroscopy, we demonstrate a wide tunability of the SPR by tailoring the inner hemisphere diameter, while keeping the outer diameter fixed. Deposition of extra Au on top of thick, previously stripped hemispherical shells isolates optical response contributions from Au grain- and island-mediated roughness, and unsharpening contact areas in form of decreasing LSPR quality factor. Two-photon luminescence scanning optical microscopy of shells with different thicknesses, applying several different laser wavelengths, is exploited to map local electromagnetic hot spots and correlate the high field enhancements with the linear reflection spectroscopy measurements.

© 2011 OSA

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(240.4350) Optics at surfaces : Nonlinear optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.4020) Scattering : Mie theory
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: October 4, 2011
Revised Manuscript: December 2, 2011
Manuscript Accepted: December 9, 2011
Published: December 21, 2011

Virtual Issues
Vol. 7, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Peter Krohne-Nielsen, Sergey M. Novikov, Jonas Beermann, Per Morgen, Sergey I. Bozhevolnyi, and Ole Albrektsen, "Tuning surface plasmons in interconnected hemispherical Au shells," Opt. Express 20, 534-546 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-1-534


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