Nonlinear optical properties of CNHP4 nanofibers: Molecular dipole orientations and two photon absorption cross-sections |
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Authors: | J. Brewer M. Schiek |
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Affiliation: | a MEMPHYS/BMB, University of Southern Denmark, Campusvej 33, DK-5230 Odense M, Denmark b NanoSYD, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark |
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Abstract: | Polarized second harmonic measurements are used to determine the in- and out-of plane orientations of molecular dipoles in optical active, elongated, surface bound nanoaggregates. As a specific example, nonlinear optical active nanofibers grown from CNHP4 molecular dipoles on muscovite mica are investigated. The orientation of the dipoles relative to the substrate is found to be 7 ± 5°, whereas that of the dipoles relative to the long nanofiber axes is ± 13 ± 5°. Following 780 nm femtosecond laser excitation, the two photon action potential ησ2 for CNHP4 is determined to be 4.7 × 10−54 cm4 s/photon. For comparison, ησ2 for para-hexaphenylene nanofibers is measured to be 12 × 10−54 cm4 s/photon. |
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