Abstract
Waveguide linear-dichroism measurements were used in determining the molecular orientation of N-(sulfopropyl)-4-(p-dioctylaminostyryl) pyridinium in Langmuir–Blodgett monolayers upon 150-μm-thick glass (Ti:Zn) substrates in real time. Acquisition of complete spatial-decay curves in t − 1 s with Plaser = 100 μW was made possible by combining propagation in integrated-optical structures with direct imaging of monolayer or glass fluorescence onto the active area of a charge-coupled device camera. Multichannel detection permitted measurement of optical waveguide loss coefficients and ultimately of molecular orientations in approximately 10−3 of the amount of time required by previous methodology. The effects of sample preparation and materials processing on the accuracy and precision of dichroic ratios are discussed. Observed dichroic ratios for a hemicyanine dye revealed no measurable change in the orientation of the electronic transition-dipole moment when Langmuir–Blodgett films were deposited at different surface pressures. These results are in good agreement with the results from singly resonant second-harmonic generation experiments.
© 1991 Optical Society of America
Full Article | PDF ArticleMore Like This
Graham H. Cross, Ian R. Girling, Ian R. Peterson, Neil A. Cade, and John D. Earls
J. Opt. Soc. Am. B 4(6) 962-967 (1987)
T. G. Zhang, C. H. Zhang, and G. K. Wong
J. Opt. Soc. Am. B 7(6) 902-907 (1990)
J. D. LeGrange, L. A. King, K. D. Singer, H. E. Katz, and M. L. Schilling
J. Opt. Soc. Am. B 6(10) 1946-1950 (1989)