Physics in plasmonic and Mie scattered near-field for efficient surface-enhanced Raman scattering template

Akira Zenidaka, Toshiyuki Honda, Mitsuhiro Terakawa

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    We describe the physics of the SERS based on the optical near-field intensity enhancement on the metallic (plasmonic) and the nonmetallic (Mie scattering) nanostructured substrates with two-dimensional (2D) periodic nanohole arrays. The calculation by the Finite-Difference Time-Domain (FDTD) method revealed that the optical intensity enhancement increases with the increase of the thickness of a gold film coating on the nonmetallic (dielectric) nanostructured Si, GaAs, and SiC substrates. The resonance spectrum shifts with the changes in the geometrical structure of the void diameter and inter-void distance. It was clarified that the optical intensity enhancement obtained with the gold-coated substrate is equivalent to that with a gold substrate at 70-nm thick gold coating on the dielectric substrates in this structure. The resonance spectral bandwidth for Mie scattering and plasmonic near-fields is different. Therefore, if the Stokes line of the Raman scattering is located within the resonance bandwidth, the SERS signal is enhanced proportionally to the fourth power of the electric near-field. However, if the Stokes shift is located out of the resonance bandwidth, the SERS signal enhancement is only proportional to the square of the scattered near-field.

    Original languageEnglish
    Pages (from-to)393-398
    Number of pages6
    JournalApplied Physics A: Materials Science and Processing
    Volume105
    Issue number2
    DOIs
    Publication statusPublished - 2011 Nov 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)

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