7 December 2001 Thienyl-bridged oligomeric squaraines of the indole series: synthesis and optical properties
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The third-order optical polarizabilities (gamma) of a new homologous series of oligomeric squaraines of the indole series (monomer-pentamer) and of corresponding monomers were investigated by degenerate four wave mixing (DFWM) at 1064 nm and related to results from two-photon absorption experiments in an energy range from 1.75 to 3.2 eV. Important two-photon contributions can be deduced to vibronic coupling and the influence to (gamma) has been considered within a four-level model. The nature of the subchromophore interaction within the oligomers can succesfully be described as mainly electrostatic within the framework of simple exciton coupling theory.
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Walter Grahn, Walter Grahn, Ulf Lawrentz, Ulf Lawrentz, Dieter Scherer, Dieter Scherer, Robert Doerfler, Robert Doerfler, Andreas Feldner, Andreas Feldner, Markus Schwoerer, Markus Schwoerer, Christoph Lambert, Christoph Lambert, Ina Dix, Ina Dix, Peter George Jones, Peter George Jones, } "Thienyl-bridged oligomeric squaraines of the indole series: synthesis and optical properties", Proc. SPIE 4461, Linear and Nonlinear Optics of Organic Materials, (7 December 2001); doi: 10.1117/12.449849; https://doi.org/10.1117/12.449849

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