Hotspot-mediated ultrafast nonlinear control of multifrequency plasmonic nanoantennas

Martina Abb, Yudong Wang, C. H. de Groot and Otto L. Muskens ()
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Martina Abb: Faculty of Physical Sciences and Engineering, University of Southampton, Highfield
Yudong Wang: Faculty of Physical Sciences and Engineering, University of Southampton, Highfield
C. H. de Groot: Nano Group, Faculty of Physical Sciences and Engineering, University of Southampton, Highfield
Otto L. Muskens: Faculty of Physical Sciences and Engineering, University of Southampton, Highfield

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Plasmonic devices have a unique ability to concentrate and convert optical energy into a small volume. There is a tremendous interest in achieving active control of plasmon resonances, which would enable switchable hotspots for applications such as surface-enhanced spectroscopy and single molecule emission. The small footprint and strong-field confinement of plasmonic nanoantennas also holds great potential for achieving transistor-type devices for nanoscale-integrated circuits. To achieve such a functionality, new methods for nonlinear modulation are required, which are able to precisely tune the nonlinear interactions between resonant antenna elements. Here we demonstrate that resonant pumping of a nonlinear medium in a plasmonic hotspot produces an efficient transfer of optical Kerr nonlinearity between different elements of a multifrequency antenna. By spatially and spectrally separating excitation and readout, isolation of the hotspot-mediated ultrafast Kerr nonlinearity from slower, thermal effects is achieved.

Date: 2014
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DOI: 10.1038/ncomms5869

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