Femtosecond laser processing using subwavelength thin metal slit arrays

Akifumi Moroki, Riichi Kitano, Minoru Obara, Hiroyuki Tsuda

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We have studied femtosecond laser processing using subwavelength thin metal slits patterned onto Si substrates. A thin Ta film (200nm thickness) with a periodic-structured slit array (200-1000nm width) was formed on the Si substrates. The ablation thresholds of the Ta and Si were investigated. Near-field enhancement effects were observed at the edge of the metal slit arrays. Ridge structures were created in the slits on the Si surfaces using a single laser shot. In addition, an interesting processing effect was observed that was dependent on the polarization of the beam; only a p-polarized beam could create grooves perpendicular to the slits on the Si substrate. The grooves were formed under the metal layer. Our experimental results concerning the enhancement of the electrical field at the edge of the slits were consistent with the results from finite-difference time-domain simulations.

    Original languageEnglish
    Pages (from-to)8753-8758
    Number of pages6
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume44
    Issue number12
    DOIs
    Publication statusPublished - 2005 Dec 8

    Keywords

    • FDTD
    • Femtosecond
    • Laser ablation
    • Near-field
    • Periodic structure
    • Si
    • Subwavelength
    • Surface plasmon
    • Ta
    • Thin metal

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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