Plasmonic nano-comb structures for efficient large-area second harmonic generation

Hongchul Sim, Hee Jin Lim, Jung Hwan Song, Myung-Ki Kim, Yong Hee Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We propose and demonstrate plasmonic nano-comb (PNC) structures for efficient large-area second-harmonic generation (SHG). The PNCs are made of 250 nm-thick gold film and have equally-spaced 30 nmslits filled with ployvinylidene fluoride-co-trifluoroethylene (P(VDF-TrFE)). The PNC with 1.0 μm-spacing couples resonantly with 1.56 μm 100-fs laser beams. For the 1.0 μm-spacing PNCs under the fixed-pumppower condition, the nonlinear SHG power remains almost independent of the pump diameter ranging from 2 μm to 6 μm. The SHG power from the resonant PNC is measured to be 8 times larger than that of the single-nanogap metallic structure, when the pump beam is tightly-focused to 2 μm in diameter in both cases. This relative enhancement of the total nonlinear SHG signal power reaches up to >200 when the pump beam diameter is increased to 6 μm. We attribute this unusual phenomenon to the resonant coupling of the finite-size pump wave with the finite-size one-dimensional plasmonic mode.

Original languageEnglish
Pages (from-to)17116-17121
Number of pages6
JournalOptics Express
Volume22
Issue number14
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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