11 September 2013 Effect of metal arrangement on localized surface plasmon polaritons in bimetallic nanoparticles
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Colloids compound of Au/Ag nanoparticles with heterogeneous arrangement of two metals were fabricated by various techniques in the past. Laser ablation was reported as a proper technique to fabricate core/shell nanoparticles by Han et al (Appl. Phys. Lett. 92, 023116/1-023116/3 (2008)) and Chen et al (Plasmonics 7, 509-513 (2012)). The detail analysis of plasmonic properties for several metal arrangements has been done using the finite-difference time-domain (FDTD) method. The nanoparticles have been modeled as (i) core/shell nanospheres, (ii) bimetallic particles consisting of two parts (Au and Ag), or (iii) colloid consisting of pure Au and Ag nanoparticles. Results of numerical simulations show that all three investigated nanoparticle metal arrangement systems exhibit shift of the plasmonic wavelength with increase of the Ag/Au volume ratio in a similar way as recorded in the experiment. It points out that it is not possible to distinguish the metal arrangements in nanoparticles by the optical methods only and the conclusions from optical properties can be misleading. Thus optical methods can certainly prove only that bimetallic nanoparticles consist of alloy or phase separated metals.
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Anton Kuzma, Anton Kuzma, Martin Weis, Martin Weis, Jozef Chovan, Jozef Chovan, František Uherek, František Uherek, } "Effect of metal arrangement on localized surface plasmon polaritons in bimetallic nanoparticles", Proc. SPIE 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI, 88092A (11 September 2013); doi: 10.1117/12.2026595; https://doi.org/10.1117/12.2026595

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