Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


Power-Law-Distributed Dark States are the Main Pathway for Photobleaching of Single Organic Molecules

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Jacob P. Hoogenboom, Erik M. H. P. van Dijk, Jordi Hernando, Niek F. van Hulst, and María F. García-Parajó
Physical Review Letters
vol. 95 097401 aug 26 2005

We exploit the strong excitonic coupling in a superradiant trimer molecule to distinguish between long-lived collective dark states and photobleaching events. The population and depopulation kinetics of the dark states in a single molecule follow power-law statistics over 5 orders of magnitude in time. This result is consistent with the formation of a radical unit via electron tunneling to a time-varying distribution of trapping sites in the surrounding polymer matrix. We furthermore demonstrate that this radicalization process forms the dominant pathway for molecular photobleaching.
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