Journal
OPTICS EXPRESS
Volume 18, Issue 21, Pages 21636-21644Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.021636
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- Brazilian agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Brazilian agency Fundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco (FACEPE)
- Brazilian Ministry of Science and Technology
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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, chi((3))(sh) = - 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, chi((5))(sh) = - 1.4 x 10(-24) m(4)/V-4, were obtained. The present results offers new perspectives for nonlinear plasmonics in the near - infrared. (C) 2010 Optical Society of America
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