Nanoantenna-enhanced ultrafast nonlinear spectroscopy of a single gold nanoparticle

Thorsten Schumacher, Kai Kratzer, David Molnar, Mario Hentschel, Harald Giessen and Markus Lippitz ()
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Thorsten Schumacher: Ultrafast Nanooptics Group, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Kai Kratzer: Ultrafast Nanooptics Group, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
David Molnar: Ultrafast Nanooptics Group, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Mario Hentschel: Ultrafast Nanooptics Group, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Harald Giessen: 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany.
Markus Lippitz: Ultrafast Nanooptics Group, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Nature Communications, 2011, vol. 2, issue 1, 1-5

Abstract: Abstract Optical nanoantennas, just like their radio-frequency equivalents, enhance the light-matter interaction in their feed gap. Antenna enhancement of small signals promises to open a new regime in linear and nonlinear spectroscopy on the nanoscale. Without antennas especially the nonlinear spectroscopy of single nanoobjects is very demanding. Here we present the first antenna-enhanced ultrafast nonlinear optical spectroscopy. In particular, we use the antenna to determine the nonlinear transient absorption signal of a single gold nanoparticle caused by mechanical breathing oscillations. We increase the signal amplitu-de by an order of magnitude, which is in good agreement with our analytical and numerical models. Our method will find applications in linear and nonlinear spectroscopy of single nanoobjects, especially in simplifying such challenging experiments as transient absorption or multiphoton excitation.

Date: 2011
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DOI: 10.1038/ncomms1334

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