Nonlinear absorption tuning by composition control in bimetallic plasmonic nanoprism arrays
The nonlinear absorption properties of bidimensional arrays of Au-Ag bilayered nanoprisms have been investigated by z-scan measurements as a function of the bimetallic nanoprism composition. A tunable ps laser system was used to excite the ultrafast, electronic nonlinear response matching the laser...
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| Veröffentlicht in: | Nanoscale 2015-08, Vol.7 (29), p.12411-12418 |
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| container_issue | 29 |
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| container_title | Nanoscale |
| container_volume | 7 |
| creator | Cesca, Tiziana Michieli, Niccolò Kalinic, Boris Sánchez-Espinoza, Ana Rattin, Marco Russo, Valentina Mattarello, Valentina Scian, Carlo Mazzoldi, Paolo Mattei, Giovanni |
| description | The nonlinear absorption properties of bidimensional arrays of Au-Ag bilayered nanoprisms have been investigated by z-scan measurements as a function of the bimetallic nanoprism composition. A tunable ps laser system was used to excite the ultrafast, electronic nonlinear response matching the laser wavelength with the quadrupolar surface plasmon resonances, in the visible range, of each nanoprism array. Due to the strong electromagnetic field confinement effects at the nanoprism tips, demonstrated by finite element method simulations, these nanosystems proved to have enhanced nonlinear optical properties. Moreover, a tunable changeover from reverse saturable absorption (RSA) to saturable absorption (SA) can be obtained by properly controlling the bimetallic composition of the nanoprisms, without modifying the overall morphology of the nanosystems. This capability makes these nanosystems extremely interesting for the realization of solid-state nanophotonic devices with enhanced ultrafast nonlinear optical properties. |
| doi_str_mv | 10.1039/c5nr01715g |
| format | Article |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Arrays Bimetals Electronics Lasers Nanostructure Nonlinearity Optical properties Tuning |
| title | Nonlinear absorption tuning by composition control in bimetallic plasmonic nanoprism arrays |
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