7 December 2001 In-situ second harmonic generation measurements of the formation of ionically self-assembled monolayers
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Recently, ionically self-assembled monolayers (ISAMs) of polymers with nonlinear optical chromophores have been shown to spontaneously exhibit a preferential ordering during the deposition process. This gives rise to a substantial second order nonlinear optical (NLO) response. Here, we use this second harmonic generation (SHG) to our advantage in the in situ study of the deposition of ISAMs. Upon immersion in the NLO-active polyelectrolyte solution, the SHG rises sharply over the first minute, demonstrating a rapid adsorption process. Immersion in the NLO-inactive partner polyelectrolyte leads to an instantaneous reduction in the SHG signal. We also show that the adsorption and ordering of a noncentrosymmetric nonlinear optical polymer increases with increasing PCBS concentration. These studies provide deeper understanding of the processes by which noncentrosymmetric order is formed in ISAM films and allows design of improved self-assembled nonlinear optical materials.
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Charles Brands, Charles Brands, Patrick J. Neyman, Patrick J. Neyman, M. Guzy, M. Guzy, S. M. Shah, S. M. Shah, Rick M. Davis, Rick M. Davis, Kevin Van Cott, Kevin Van Cott, Hong Wang, Hong Wang, Harry W. Gibson, Harry W. Gibson, James Randy Heflin, James Randy Heflin, } "In-situ second harmonic generation measurements of the formation of ionically self-assembled monolayers", Proc. SPIE 4461, Linear and Nonlinear Optics of Organic Materials, (7 December 2001); doi: 10.1117/12.449844; https://doi.org/10.1117/12.449844

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