Intensity enhancement of vibrational sum frequency generation by gap-mode plasmon resonance

Masanari Okuno, Taichi Tokimoto, Miharu Eguchi, Hideaki Kano, Taka Aki Ishibashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A metal sphere-plane structure consisting of gold nanoparticles, p-methylbenzenethiol and a gold substrate was measured by vibrational sum frequency generation spectroscopy with four excitation wavelengths, 630, 680, 720, and 780 nm. The enhancement factors of Raman signals were estimated to be 250 and 104 for the 532 and 647 nm excitation. Contrastingly, we found that the enhancements of VSFG signals were much smaller, a factor of 5 at maximum. We speculate that the small enhancement factor of VSFG signals is due to the coherent nature of the VSFG process or the extinction of the infrared laser by the gold nanoparticles.

Original languageEnglish
Pages (from-to)83-87
Number of pages5
JournalChemical Physics Letters
Volume639
DOIs
Publication statusPublished - Oct 16 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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