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SUMMARY:Optical properties and structure of C8S3 aggregates - Sebastiaan M
 aarten Vlaming\, MIT USA
DTSTART:20110705T133000Z
DTEND:20110705T143000Z
UID:TALK31997@talks.cam.ac.uk
CONTACT:Jenny Clark
DESCRIPTION:Supramolecular nanotubes that interact with light have garnere
 d increasing interest\nas well-defined nanoscale materials. The close pack
 ing of the molecules in these\nassemblies leads to extended electronic exc
 itation states\, whose outstanding optical\nproperties may be harnessed in
  opto-electronic devices aimed at light harvesting\nantennae\, tunable lig
 ht sensitization\, and efficient energy transport. Recent examples\ninclud
 e nanotubes containing many thousands of molecules of hexabenzocoronene\n(
 HBC) derivatives\, of porphyrins\, of cyanine dyes\, and chlorosomes of ba
 cteria.\n\nThe exciton states and the energy transport properties of such 
 molecular nanotubes\nattract considerable interest for the aforementioned 
 application in artificial light-\nharvesting systems and energy transport 
 wires. In this talk\, I will discuss some\ntheoretical methods used to des
 cribe the linear optical response of these cylindrical\nmolecular aggregat
 es\, in particular focusing on the close relation between the optical\npro
 perties and the underlying molecular structure\, and on the effects induce
 d by\ndisordered environments. As an application\, I will discuss numerica
 l results obtained\nfor double-walled cylinders formed by the cyanine dye 
 C8S3. By comparison to\nexperimental measurements on both the isotropic an
 d polarized spectral responses\, a\ndetailed microscopic structure is prop
 osed.
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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