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In Situ Second Harmonic Generation Measurements of the Growth of Nonlinear Optical Ionically Self-Assembled Monolayers

Published online by Cambridge University Press:  21 March 2011

C. Brands ,
P.J. Neyman ,
M.T. Guzy ,
S. Shah ,
K.E. Van Cott ,
R.M. Davis ,
H. Wang ,
H.W. Gibson  and
J.R. Heflin
C. Brands
Affiliation:
Department of Physics, Virginia Tech Blacksburg, VA 24061
P.J. Neyman
Affiliation:
Department of Materials Science and Engineering, Virginia Tech Blacksburg, VA 24061
M.T. Guzy
Affiliation:
Department of Chemical Engineering, Virginia Tech Blacksburg, VA 24061
S. Shah
Affiliation:
Department of Chemical Engineering, Virginia Tech Blacksburg, VA 24061
K.E. Van Cott
Affiliation:
Department of Chemical Engineering, Virginia Tech Blacksburg, VA 24061
R.M. Davis
Affiliation:
Department of Chemical Engineering, Virginia Tech Blacksburg, VA 24061
H. Wang
Affiliation:
Department of Chemical Engineering, Virginia Tech Blacksburg, VA 24061
H.W. Gibson
Affiliation:
Department of Chemistry, Virginia Tech Blacksburg, VA 24061
J.R. Heflin
Affiliation:
Department of Physics, Virginia Tech Blacksburg, VA 24061 Department of Materials Science and Engineering, Virginia Tech Blacksburg, VA 24061
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Abstract

Ionically self-assembled monolayers (ISAMs) have recently been shown to spontaneously exhibit a polar ordering that gives rise to a substantial second order nonlinear optical (NLO) response. Here, the deposition of ISAMs has been studied in situ via second harmonic generation (SHG). We show that the adsorption and ordering of a noncentrosymmetric nonlinear optical polymer is constant over a wide range of concentrations. Upon immersion in the NLO-active polyelectrolyte solution, the SHG rises sharply over the first minute. Immersion in the NLO-inactive partner polyelectrolyte leads to a reduction in the SHG signal. Furthermore, when the film is removed from the NLO-active solution and allowed to dry, the SHG increases rapidly as the water evaporates. These studies provide greater understanding of the processes by which noncentrosymmetric order is formed in ISAM films and allows design of improved self- assembled nonlinear optical materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 660: Symposia JJ – Organic Electronic & Photonic Materials and Devices , 2000 , JJ8.32
Copyright
Copyright © Materials Research Society 2001

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References

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