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Title
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Single particle deformation and analysis of silica-coated gold nanorods before and after femtosecond laser pulse excitation
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Author
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Abstract
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| We performed single particle deformation experiments on silica-coated gold nanorods under femtosecond (fs) illumination. Changes in the particle shape were analyzed by electron microscopy and associated changes in the plasmon resonance by electron energy loss spectroscopy. Silica-coated rods were found to be more stable compared to uncoated rods but could still be deformed via an intermediate bullet-like shape for silica shell thicknesses of 14 nm. Changes in the size ratio of the rods after fs-illumination resulted in blue-shifting of the longitudinal plasmon resonances. Two-dimensional spatial mapping of the plasmon resonances revealed that the flat side of the bullet-like particles showed a less pronounced longitudinal plasmonic electric field enhancement. These findings were confirmed by finite-difference time-domain (FDTD) simulations. Furthermore, at higher laser fluences size reduction of the particles was found as well as for particles that were not completely deformed yet. |
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Language
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English
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Source (journal)
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Nano letters / American Chemical Society. - Washington
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Publication
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Washington
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2016
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ISSN
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1530-6984
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DOI
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10.1021/ACS.NANOLETT.5B04851
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Volume/pages
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16
:3
(2016)
, p. 1818-1825
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ISI
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000371946300045
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Pubmed ID
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26871607
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Full text (Publisher's DOI)
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Full text (open access)
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