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.


Single-molecule pump-probe detection resolves ultrafast pathways in individual and coupled quantum systems

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Erik M.H.P. van Dijk, Jordi Hernando, Juan-José García-López, Mercedes Crego-Calama, David N. Reinhoudt, Laurens Kuipers, María F. García-Parajó Niek F. van Hulst
Physical Review Letters
vol 94 p078302-1 - p078302-4 25 feb 2005

We report the first experimental study of individual molecules with femtosecond time resolution using a novel ultrafast single-molecule pump-probe method. A wide range of relaxation times from below 100 up to 400 fs is found, revealing energy redistribution over different vibrational modes and phonon coupling to the nanoenvironment. Addressing quantum-coupled molecules we find longer decay times, pointing towards inhibited intramolecular decay due to delocalized excitation. Interestingly, each individual system shows discrete jumps in femtosecond response, reflecting sudden breakup of the coupled superradiant state. copyright2005 The American Physical Society
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