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Large optical nonlinearity of ITO nanorods for sub-picosecond all-optical modulation of the full-visible spectrum

Author

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  • Peijun Guo

    (Northwestern University)

  • Richard D. Schaller

    (Center for Nanoscale Materials, Argonne National Laboratory
    Northwestern University)

  • Leonidas E. Ocola

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Benjamin T. Diroll

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • John B. Ketterson

    (Northwestern University)

  • Robert P. H. Chang

    (Northwestern University)

Abstract

Nonlinear optical responses of materials play a vital role for the development of active nanophotonic and plasmonic devices. Optical nonlinearity induced by intense optical excitation of mobile electrons in metallic nanostructures can provide large-amplitude, dynamic tuning of their electromagnetic response, which is potentially useful for all-optical processing of information and dynamic beam control. Here we report on the sub-picosecond optical nonlinearity of indium tin oxide nanorod arrays (ITO-NRAs) following intraband, on-plasmon-resonance optical pumping, which enables modulation of the full-visible spectrum with large absolute change of transmission, favourable spectral tunability and beam-steering capability. Furthermore, we observe a transient response in the microsecond regime associated with slow lattice cooling, which arises from the large aspect-ratio and low thermal conductivity of ITO-NRAs. Our results demonstrate that all-optical control of light can be achieved by using heavily doped wide-bandgap semiconductors in their transparent regime with speed faster than that of noble metals.

Suggested Citation

  • Peijun Guo & Richard D. Schaller & Leonidas E. Ocola & Benjamin T. Diroll & John B. Ketterson & Robert P. H. Chang, 2016. "Large optical nonlinearity of ITO nanorods for sub-picosecond all-optical modulation of the full-visible spectrum," Nature Communications, Nature, vol. 7(1), pages 1-10, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12892
    DOI: 10.1038/ncomms12892
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