SHG of ultrathin films of metal porphyrins on BK7 glass in total internal reflection geometry: Theory and experiments

Lorenzo Echevarria, Pedro Nieto, Héctor Gutiérrez, Vladimiro Mújica, Manuel Caetano

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present a novel methodology that combines a theoretical description and experimental characterization of the structure and first hyperpolarizability of ultrathin films of VO-octaethyl-porphyrins (VOOETP, Scheme 1) adsorbed on a BK7 activated glass. Films were characterized by ellipsometry, and the geometry is inferred from a consistent comparison between the theoretical hyperpolarizability and the experimental measurements. The hyperpolarizability is determined through second harmonic generation (SHG) techniques, and ellipsometry is used independently to determine the thickness of the film. An analysis of the Fourier components of the tensor relating the incident and SHG fields reveals the existence of a linear dependence between the Fourier components that greatly reduces the amount of required experimental information. Using this methodology, we obtain reasonable agreement between the observed and calculated intrinsic hyperpolarizabilities (βzexpztheo = 0.95) that we attribute to the dimer.

Original languageEnglish
Pages (from-to)9332-9338
Number of pages7
JournalJournal of Physical Chemistry B
Volume107
Issue number35
Publication statusPublished - Sep 4 2003

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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