Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering

Mitsuhiro Terakawa, Yuto Tanaka, Go Obara, Tatsunori Sakano, Minoru Obara

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    15 Citations (Scopus)


    We investigate the dependence of the size parameter in the Mie scattering theory on the near-field enhanced Raman scattering properties for high dielectric constant ZnO nanorods grown randomly by PLD (pulsed laser deposition). High Raman signals of Rhodamine 6G (R6G) at 532 nm excitation wavelength were observed with nanorods of 400 nm average diameter. This experimental result was explained theoretically by the size parameter described in the Mie scattering theory, not by surface plasmon polaritons. This was also confirmed by the near-field distribution calculated by the FDTD (Finite-Difference Time Domain) method. The ZnO nanorods with 400 nm average diameter can detect as low as 1 μM of R6G. This near-field enhancement factor is equivalent to that with 10-nm-thick goldcoated ZnO nanorods (nanoshells) with an average core diameter of 100 nm. Controlling the diameter of bare ZnO nanorods is effective for obtaining large enhancement factors without an additional process of gold thin film coating on them.

    Original languageEnglish
    Pages (from-to)661-665
    Number of pages5
    JournalApplied Physics A: Materials Science and Processing
    Issue number3
    Publication statusPublished - 2011 Mar 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)


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