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Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

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5 Author(s)
Heflin, J.R. ; Department of Physics, Virginia Polytechnical Institute and State University, Blacksburg, Virginia 24061-0435 ; Figura, C. ; Marciu, D. ; Liu, Y.
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An ionically self-assembled monolayer (ISAM) technique for thin-film deposition has been employed to fabricate materials possessing the noncentrosymmetry that is requisite for a second-order, χ(2), nonlinear optical response. As a result of the ionic attraction between successive layers, the ISAM χ(2) films self-assemble into a noncentrosymmetric structure that has exhibited no measurable decay of χ(2) at room temperature over a period of more than one year. The second-harmonic intensity of the films exhibits the expected quadratic dependence on film thickness up to at least 100 bilayers, corresponding to a film thickness of 120 nm. The polarization dependence of the second-harmonic generation yields a value of 35° for the average tilt angle of the nonlinear optical chromophores away from the surface normal. © 1999 American Institute of Physics.

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Applied Physics Letters  (Volume:74 ,  Issue: 4 )