Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics I
O 46.7: Talk
Wednesday, April 2, 2014, 12:00–12:15, TRE Phy
Tayloring the third harmonic response of plasmonic nanoantennas by incorporation of dielectric nanocrystals — •Bernd Metzger1, Mario Hentschel1,2, Thorsten Schumacher1,2, Markus Lippitz1,2, Xingchen Ye3, Christopher B. Murray3, Bastian Knabe4, Karsten Buse4, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3Department of Chemistry, University of Pennsylvania, Philadelphia, USA — 4Fraunhofer Institute for Physical Measurement Techniques IPM, Freiburg, Germany
The electric field strength in the hot-spot of a plasmonic nanoantenna [1] can surpass the far-field amplitude by more than an order of magnitude, which caused scientists to envision enhanced conversion efficiencies for nonlinear optical effects [2]. Hence, we incorporate indium tin oxide (ITO) nanocrystals into the hot-spot of plasmonic gold gap-antennas and investigate the nonlinear third harmonic (TH) response of the hybrid nanostructure arrays. We find an enhancement by about a factor of two of the TH emission when comparing the hybrid to bare gap-antenna arrays, where no dielectric nanocrystals have been incorporated. Surprisingly, we find that the enhancement is not due to the third order susceptibility of the ITO nanocrystals, but due to the optical nonlinearity of the gold and predominantly due to an enhanced dipole moment of the plasmonic oscillations in the gold gap-antennas. [1] L. Novotny and N. van Hulst, Nature Photon. 5, 83 (2011). [2] M. Kauranen and A. V. Zayats, Nature Photon. 6, 737 (2012).