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21 February 2011 Chemical damping of the localized surface plasmon polariton resonance: infuence of different chemical environments
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Abstract
In this paper, we present systematic measurements of the ultrafast dephasing time T2 of surface plasmon excitations in silver nanoparticles exposed to different chemical environments. The objective of the measurements is, whether or not different chemical environments infuence independently the damping of the plasmon resonance, i.e., clarify if the Matthiessen law can always be applied. For this purpose, measurements of T2 in the size range between Req = 7 nm and 18 nm were carried out for nanoparticles on different substrates and in different chemical environments. Subsequently, the damping parameter A, which quantifes the infuence of extrinsic and intrinsic size effects of the different damping mechanisms on T2, has been determined. While A = 0.13 nm/fs has been determined for quasi-free nanoparticles, the A parameter increases to approximately A = 0.55 nm/fs for nanoparticles on a quartz substrate, and further to A = 1.8 nm/fs for supported nanoparticles covered with SO2. Most importantly, the well known Matthiessen law cannot be applied to the nanoparticle systems investigated here, because different chemical damping channels do not contribute independently to the damping of the surface plasmon resonance.
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Frank Hubenthal and Frank Träger "Chemical damping of the localized surface plasmon polariton resonance: infuence of different chemical environments", Proc. SPIE 7922, Synthesis and Photonics of Nanoscale Materials VIII, 79220D (21 February 2011); https://doi.org/10.1117/12.876270
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