Third-Order Nonlinear Optical Response of Gold-Island Films

Authors

  • Evangelia Xenogiannopoulou,

    1. Institute of Chemical Engineering and High-Temperature Chemical Processes (ICEHT) Foundation for Research and Technology-Hellas (FORTH) Patras 26504 (Greece)
    2. Department of Physics, University of Patras Patras 26500 (Greece)
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  • Kostas Iliopoulos,

    1. Institute of Chemical Engineering and High-Temperature Chemical Processes (ICEHT) Foundation for Research and Technology-Hellas (FORTH) Patras 26504 (Greece)
    2. Department of Physics, University of Patras Patras 26500 (Greece)
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  • Stelios Couris,

    Corresponding author
    1. Institute of Chemical Engineering and High-Temperature Chemical Processes (ICEHT) Foundation for Research and Technology-Hellas (FORTH) Patras 26504 (Greece)
    2. Department of Physics, University of Patras Patras 26500 (Greece)
    • Stelios Couris, Institute of Chemical Engineering and High-Temperature Chemical Processes (ICEHT) Foundation for Research and Technology-Hellas (FORTH) Patras 26504 (Greece).===

      Israel Rubinstein, Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel).===

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  • Tanya Karakouz,

    1. Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel)
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  • Alexander Vaskevich,

    1. Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel)
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  • Israel Rubinstein

    Corresponding author
    1. Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel)
    • Stelios Couris, Institute of Chemical Engineering and High-Temperature Chemical Processes (ICEHT) Foundation for Research and Technology-Hellas (FORTH) Patras 26504 (Greece).===

      Israel Rubinstein, Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel).===

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  • S.C., A.V., and I.R. acknowledge partial support of this work by the European Union IST Program “NANOPHOS” (No. IST-2001-39112). This work was partially supported by the Greek Ministry of Development Program PENED (Grant No. 888) (S.C.) and by the Israel Science Foundation (Grant No. 307/03) (A.V. and I.R.).

Abstract

Films of gold nanoscaled islands with thicknesses ranging between 0.5 and 15 nm were prepared by thermal evaporation onto untreated and aminosilane-pretreated glass substrates. Post-deposition annealing was found to modify the morphological characteristics of the islands (e.g., average island area and height, inter-island distance, etc.), resulting in changes of the localized surface plasmon resonance (SPR) characteristics and, therefore, modifying the nonlinear optical (NLO) response of the films. The NLO response of both unannealed and annealed (20 h at 200 °C) films was studied by means of the optical Kerr effect (OKE), using 35 ps, 532 nm laser excitation, while measurements performed by means of the Z-scan technique allowed for the determination of both the nonlinear refraction and absorption characteristics of the films. The results are discussed and compared with other reports.

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