All-Optical Control of a Single Plasmonic Nanoantenna-ITO Hybrid

SEPnet and the Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.
Nano Letters (Impact Factor: 13.59). 06/2011; 11(6):2457-63. DOI: 10.1021/nl200901w
Source: PubMed

ABSTRACT We demonstrate experimentally picosecond all-optical control of a single plasmonic nanoantenna embedded in indium tin oxide (ITO). We identify a picosecond response of the antenna-ITO hybrid system, which is distinctly different from transient bleaching observed for gold antennas on a nonconducting SiO(2) substrate. Our experimental results can be explained by the large free-carrier nonlinearity of ITO, which is enhanced by plasmon-induced hot-electron injection from the gold nanoantenna into the conductive oxide. The combination of tunable antenna-ITO hybrids with nanoscale plasmonic energy transfer mechanisms, as demonstrated here, opens a path for new ultrafast devices to produce nanoplasmonic switching and control.

Download full-text


Available from: Otto L. Muskens, Aug 19, 2015
  • Source
    • "discussed previously related to a much slower, thermo-optic nonlinearity of ITO [33], where we found a spectral response closely resembling the shape and sign change found in Fig. 3g. Other studies have identified carrier density modulation as the governing nonlinearity of ITO under UV laser excitation [34]. "
    [Show abstract] [Hide 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.
    Nature Communications 09/2014; 5:4869. DOI:10.1038/ncomms5869 · 10.74 Impact Factor
  • Source
    • "For the fast scan (Figure 5(b)), however, the gold pad itself has a clearly positive signal unlike its immediate surroundings. We observe a corona of negative signal up to 2 µm around the contamination dot, which is even further than the 126 nm hot electron diffusion length that we suggest in [6]. This is partly due to the size of the pump beam (around 2 µm FWHM), which generates heat and hot electrons in areas around the smaller probe spot. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We present here a new type of device using nonlinear hybrid antenna-semiconductor (ITO) interaction. We observe a picosecond transient response from the antenna that cannot be explained by either pure ITO or antenna nonlinearities independently. We study the dependence of the hybrid interaction on several experimental parameters, including the polarization of excitation and detection.
    International Journal of Optics 01/2012; 2012(1687-9384). DOI:10.1155/2012/132542
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A new concept of a nonlinear plasmonic nanoantenna with self-tunable scattering pattern (indicatrix) is suggested. It is shown that the onset of modulational instability in a nanoantenna consisting of two identical nonlinear metallic nanoparticles results in dynamic energy exchange between the eigenmodes of the nanodimer, accompanied by periodic rotation and switching of the scattering pattern. Such a nanoantenna features a wide scanning sector, a relatively low working threshold, and a short response time. This makes it attractive for applications in nanophotonics and biology.
    JETP Letters 02/2013; 96(12). DOI:10.1134/S0021364012240071 · 1.36 Impact Factor
Show more