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| - Enhancement of Two-Photon Absorption Cross-Section in Macrocyclic Thiophenes withCavities in the Nanometer Regime
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| - The linear and nonlinear optical properties of two thiophene-based cyclic molecules have been investigated.These molecules represent nanometer sized cavities which may be useful for novel photonic devices. Byvirtue of long-range interactions, these chromophores serve as novel architectures for enhanced two-photonabsorption (TPA) properties. Measurements of the different size ring structures showed a 550% increase inthe TPA cross-section for the larger macrocycle. Electronic structure calculations have suggested an increasein coupling of the excited states in these systems as the ring size is increased. Measurements of the ultrafasttransient absorption and fluorescence were carried out with these systems in order to probe the interactionbetween the chromophores. The results of the transient decays as well as fluorescence anisotropy decay timesgives stronger proof to the suggestion of delocalized states in the cyclic macrocycles. These results provideinformation regarding the optical properties of these novel systems useful for potential applications in photonics.
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