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(full pdf)
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.