Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


Single Molecule Photobleaching Probes the Exciton Wave Function in a Multichromophoric System

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J. Hernando, J.P. Hoogenboom, E.M.H.P. van Dijk, J.J. García-Lopez, M. Crego-Calama, D.N. Reinhoudt, N.F. van Hulst, and M.F. García-Parajó
Physical Review Letters
vol 93 no 23 p 236404 1-4 dec 3, 2004

The exciton wave function of a trichromophoric system is investigated by means of single molecule spectroscopy at room temperature. Individual trimers exhibit superradiance and loss of vibronic structure in emission spectrum, features proving exciton delocalization. We identify two distinct photodegradation pathways for single trimers upon sequential photobleaching of the chromophores. The rate of each pathway is a measure for the contribution of the separate dyes to the collective excited state of the system, in this way probing the wave function of the delocalized exciton. copyright 2004 The American Physical Society
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