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Optical properties and structure of C8S3 aggregates

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Supramolecular nanotubes that interact with light have garnered increasing interest as well-defined nanoscale materials. The close packing of the molecules in these assemblies leads to extended electronic excitation states, whose outstanding optical properties may be harnessed in opto-electronic devices aimed at light harvesting antennae, tunable light sensitization, and efficient energy transport. Recent examples include nanotubes containing many thousands of molecules of hexabenzocoronene (HBC) derivatives, of porphyrins, of cyanine dyes, and chlorosomes of bacteria.

The exciton states and the energy transport properties of such molecular nanotubes attract considerable interest for the aforementioned application in artificial light- harvesting systems and energy transport wires. In this talk, I will discuss some theoretical methods used to describe the linear optical response of these cylindrical molecular aggregates, in particular focusing on the close relation between the optical properties and the underlying molecular structure, and on the effects induced by disordered environments. As an application, I will discuss numerical results obtained for double-walled cylinders formed by the cyanine dye C8S3 . By comparison to experimental measurements on both the isotropic and polarized spectral responses, a detailed microscopic structure is proposed.

This talk is part of the Optoelectronics Group series.

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