11 October 1999 NLO studies of a novel phenothiazine self-assembled monolayer
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Abstract
The nonlinear optical behavior of self-assembled monolayer films of a new NLO-active molecule, PBSP, is characterized by second harmonic generation (SHG). PBSP contains a heterocyclic sulfonate head group and a highly polarizable chromophore. The films are synthesized by a nucleophilic substitution reaction on both sides of a quartz substrate that has been treated with a coupling layer. The addition of the chromophoric layer is monitored by AFM, FTIR and UV- visible spectroscopy, and SHG. The FTIR spectrum of the first layer shows weak methylene resonances, while the spectrum with the addition of the second layer shows much stronger methylene resonances and an amine resonance. The characterization of the film by SHG was done by rotating the film and generating Maker fringes. The polarization dependence of the SHG signal was also determined. The SHG signal after the nucleophilic reaction was an order of magnitude greater than before the reaction. The magnitude of the dominant element of the nonlinear susceptibility and the average molecular orientation angle of the chromophore were determined by modeling the Maker fringes and the polarization dependence of the SHG signal.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joanna L. Casson, Joanna L. Casson, Wenxi Huang, Wenxi Huang, Yongwoo Lee, Yongwoo Lee, Jean-Francois Bardeau, Jean-Francois Bardeau, Malkiat S. Johal, Malkiat S. Johal, Wang Rong, Wang Rong, Alexander DeQuan Li, Alexander DeQuan Li, Basil I. Swanson, Basil I. Swanson, Duncan W. McBranch, Duncan W. McBranch, Merritt Helvenston, Merritt Helvenston, Jeanne M. Robinson, Jeanne M. Robinson, "NLO studies of a novel phenothiazine self-assembled monolayer", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368280; https://doi.org/10.1117/12.368280
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