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Nanoantenna-enhanced ultrafast nonlinear spectroscopy of a single gold nanoparticle

✍ Scribed by Schumacher, Thorsten; Kratzer, Kai; Molnar, David; Hentschel, Mario; Giessen, Harald; Lippitz, Markus

Book ID
111928180
Publisher
Nature Publishing Group
Year
2011
Tongue
English
Weight
916 KB
Volume
2
Category
Article
ISSN
2041-1723

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✦ Synopsis

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.

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