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  • Title: High-order nonlinearity of silica-gold nanoshells in chloroform at 1560 nm.
    Author: Falcão-Filho EL, Barbosa-Silva R, Sobral-Filho RG, Brito-Silva AM, Galembeck A, de Araújo CB.
    Journal: Opt Express; 2010 Oct 11; 18(21):21636-44. PubMed ID: 20941062.
    Abstract:
    The nonlinear response of silica--gold nanoshells (SGNs) in chloroform was studied using laser pulses of 65 fs at 1560 nm. The experiments were performed using the thermally managed Z--scan technique that allows measurements of the electronic contribution for the nonlinear response, free from thermal influence. The results were analyzed using an analytical approach based on the quasi--static approximation that allowed extraction of the nonlinear susceptibility of a SGN from the data. High third--order susceptibility, χsh((3)) = - 1.5 x 10(-11) m(2)/V(2), approximately four orders of magnitude larger than for gold nanospheres in the visible, and large fifth--order susceptibility, χsh((5)) = - 1.4 x 10(-24) m(4)/V(4), were obtained. The present results offers new perspectives for nonlinear plasmonics in the near--infrared.
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