The influences of particle number on hot spots in strongly coupled metal nanoparticles chain

Z. B. Wang, B. S. Luk'yanchuk, W. Guo, S. P. Edwardson, D. J. Whitehead, L. Li, Z. Liu, K. G. Watkins

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In understanding of the hot spot phenomenon in single-molecule surface enhanced Raman scattering (SM-SERS), the electromagnetic field within the gaps of dimers (i.e., two particle systems) has attracted much interest as it provides significant field amplification over single isolated nanoparticles. In addition to the existing understanding of the dimer systems, we show in this paper that field enhancement within the gaps of a particle chain could maximize at a particle number N2, due to the near-field coupled plasmon resonance of the chain. This particle number effect was theoretically observed for the gold (Au) nanoparticles chain but not for the silver (Ag) chain. We attribute the reason to the different behaviors of the dissipative damping of gold and silver in the visible wavelength range. The reported effect can be utilized to design effective gold substrate for SM-SERS applications. © 2008 American Institute of Physics.
    Original languageEnglish
    Article number094705
    JournalJournal of Chemical Physics
    Volume128
    Issue number9
    DOIs
    Publication statusPublished - 2008

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