Degenerate optical nonlinear enhancement in epsilon-near-zero transparent conductive oxides

Carnemolla, Enrico Giuseppe and Caspani, Lucia and DeVault, Clayton and Clerici, Matteo and Vezzoli, Stefano and Bruno, Vincenzo and Shalaev, Vladimir M. and Faccio, Daniele and Boltasseva, Alexandra and Ferrera, Marcello (2018) Degenerate optical nonlinear enhancement in epsilon-near-zero transparent conductive oxides. Optical Materials Express, 8 (11). pp. 3392-3400. ISSN 2159-3930 (https://doi.org/10.1364/OME.8.003392)

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Abstract

We report the simultaneous increase of both nonlinear Kerr coefficient n2 and thirdorder nonlinear susceptibility χ(3) in aluminum zinc oxide (AZO) attained by pump-probe spectroscopy in a frequency degenerate configuration. Our experiments demonstrate a 6-fold enhancement in the third-order nonlinear susceptibility and over one order of magnitude increase in the nonlinear Kerr coefficient, while also determining two distinct operational wavelengths for optimal modulation of either the real or the imaginary part of the complex refractive index. These results, besides providing a broader spectral characterization of the third-order nonlinearity in AZO thin films, also show the fundamental advantages of performing nonlinear optics via degenerate excitation near the ENZ wavelength.

  • Item type:Article
    ID code:65723
    Dates:
    Date
    Event
    17 October 2018
    Published
    4 October 2018
    Accepted
    Notes:© 2018 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics > Institute of Photonics
    Depositing user: Pure Administrator
    Date deposited:10 Oct 2018 08:55
    Last modified:21 Apr 2024 06:53
    URI:https://strathprints.strath.ac.uk/id/eprint/65723
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