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Proceedings Paper

In-situ second harmonic generation measurements of the formation of ionically self-assembled monolayers
Author(s): Charles Brands; Patrick J. Neyman; M. Guzy; S. M. Shah; Rick M. Davis; Kevin Van Cott; Hong Wang; Harry W. Gibson; James Randy Heflin
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Paper Abstract

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.

Paper Details

Date Published: 7 December 2001
PDF: 8 pages
Proc. SPIE 4461, Linear and Nonlinear Optics of Organic Materials, (7 December 2001); doi: 10.1117/12.449844
Show Author Affiliations
Charles Brands, Virginia Polytechnic Institute and State Univ. (United States)
Patrick J. Neyman, Virginia Polytechnic Institute and State Univ. (United States)
M. Guzy, Virginia Polytechnic Institute and State Univ. (United States)
S. M. Shah, Virginia Polytechnic Institute and State Univ. (United States)
Rick M. Davis, Virginia Polytechnic Institute and State Univ. (United States)
Kevin Van Cott, Virginia Polytechnic Institute and State Univ. (United States)
Hong Wang, Virginia Polytechnic Institute and State Univ. (United States)
Harry W. Gibson, Virginia Polytechnic Institute and State Univ. (United States)
James Randy Heflin, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 4461:
Linear and Nonlinear Optics of Organic Materials
Manfred Eich; Mark G. Kuzyk, Editor(s)

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