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• W2022243216 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. The subwavelength scale of plasmonics is attractive for optical nanodevices, if greater control over such systems can be achieved. Here, the authors show the independent control of hotspot-mediated Kerr nonlinearities in a nanoantenna array, enabling individual tuning of optical pathways in the medium." @default.
• W2022243216 created "2016-06-24" @default.
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• W2022243216 date "2014-09-05" @default.
• W2022243216 modified "2023-10-13" @default.
• W2022243216 title "Hotspot-mediated ultrafast nonlinear control of multifrequency plasmonic nanoantennas" @default.
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• W2022243216 doi "https://doi.org/10.1038/ncomms5869" @default.
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