Spatially resolved surface enhanced second harmonic generation: Theoretical and experimental evidence for electromagnetic enhancement in the near infrared on a laser microfabricated Pt surface

Kurt L. Haller, Lloyd A. Bumm, Robert I. Aitkorn, Ellen J. Zeman, George C Schatz, Richard P. Van Duyne

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Surface enhanced second harmonic generation (SESHG) has been observed for the first time from a Pt surface in a -3 Torr vacuum environment. Both "smooth," mechanically polished Pt surfaces and rippled Pt microstructures prepared by laser microchemical etching in Cl 2(g) were studied with the newly developed technique of SESHG imaging. The etching procedure and the behavior of the Pt surface under the SESHG imaging conditions is reported in detail. The rippled/smooth enhancement factor for SHG excited with 80 ps, 1064 nm pulses from a cw, mode-locked Nd-YAG laser focused to a 3.1 μ 1/e2 radius ranges from 4 to 17, in qualitative agreement with theoretical calculations for isolated Pt spheroids.

Original languageEnglish
Pages (from-to)1237-1252
Number of pages16
JournalJournal of Chemical Physics
Volume90
Issue number2
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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