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  • Title: Giant nonlinear response of terahertz nanoresonators on VO2 thin film.
    Author: Kyoung J, Seo M, Park H, Koo S, Kim HS, Park Y, Kim BJ, Ahn K, Park N, Kim HT, Kim DS.
    Journal: Opt Express; 2010 Aug 02; 18(16):16452-9. PubMed ID: 20721032.
    Abstract:
    We report on an order of magnitude enhanced nonlinear response of vanadium dioxide thin film patterned with nanoresonators--nano slot antennas fabricated on the gold film. Transmission of terahertz radiation, little affected by an optical pumping for the case of bulk thin film, can now be completely switched-off: DeltaT/T approximately -0.9999 by the same optical pumping power. This unprecedentedly large optical pump-terahertz probe nonlinearity originates from the insulator-to-metal phase transition drastically reducing the antenna cross sections of the nanoresonators. Our scheme enables nanoscale-thin film technology to be used for all-optical switching of long wavelength light.
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