Self-assembled chromophoric thin film NLO materials. Effect of coupling agent surface functionalization and ion exchange processes on second harmonic generation characteristics

Ashok K. Kakkar, Shlomo Yitzchaik, Stephen B. Roscoe, Tobin J Marks, Weiping Lin, George K. Wong

Research output: Contribution to journalArticle

13 Citations (Scopus)


A systematic study of the reaction of 1-chloromethyl-4-(2-trichlorosilylethyl)-benzene (coupling agent) with the surface SiOH groups of glass for times from 15 min to 48 h, followed by stilbazole chromophore precursor deposition/quaternization, is reported. Second harmonic generation characteristics of these thin film materials indicate that a 15 min coupling agent reaction attains approximately 65% of full surface coverage (based on χzzz (2)) of benzylic chloride moieties, but that 24 h is the optimal time for maximum coverage. The surface-anchored chromophoric chloride salts in such materials undergo facile ion exchange with iodide, p-aminobenzenesulphonate, and ethyl orange, leading to enhancements in χzzz (2) of up to 50%.

Original languageEnglish
Pages (from-to)142-145
Number of pages4
JournalThin Solid Films
Issue number1-2
Publication statusPublished - Apr 15 1994


ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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