S.K. Frehan MSc (Sean)

Engineering & Materials Science

# Catalysis
# Nanostructures
# Photocathodes
# Plasmonic Nanoparticles
# Plasmonics
# Precious Metals
# Transition Metals

Physics & Astronomy

# Metal Nitrides

Whether vibronic coupling, the coupling of photoinduced electronic and nuclear vibrational motion, plays a vital role or not in long-range exciton transfer is not yet understood. I study the impact vibrational modes may have on long-range exciton transfer by employing a number of spectroscopic techniques on chlorosomes, a rod-shaped light harvesting antenna composed of self-assembled bacteriochlorophyll molecules found in green sulphur bacteria.

These bacteria can survive under extremely low light conditions due to their highly efficient exciton transport. I have set up an optical unit including a pulse shaper to produce a complex femtosecond pulse shape enabling to perturb a selected vibrational mode. The dependency of the exciton transfer rate on the pulse shape will provide strong evidence for the significance of quantum coherence.

This research is in collaboration with the groups of Prof. Huub de Groot (Leiden) and Dr. Thomas Jansen (Groningen) and funded by a TOP grant from NWO Chemical Sciences.

Eric, V., Castro, J. L., Li, X., Dsouza, L. , Frehan, S. K. , Huijser, A., Holzwarth, A. R., Buda, F., Agur Sevink, G. J., de Groot, H. J. M., & Jansen, T. L. C. (2023). Ultrafast Anisotropy Decay Reveals Structure and Energy Transfer in Supramolecular Aggregates. ACS Physical Chemistry Au, 127(34), 7487-7496. https://doi.org/10.1021/acs.jpcb.3c04719

Frehan, S. K., Dsouza, L., Li, X., Eric, V., Jansen, T. L. C. , Mul, G., Holzwarth, A. R., Buda, F., Agur Sevink, G. J., de Groot, H. J. M. , & Huijser, A. (Ed.) (2023). Photon Energy-Dependent Ultrafast Exciton Transfer in Chlorosomes of Chlorobium tepidum and the Role of Supramolecular Dynamics. The Journal of physical chemistry B, 127, 7581−7589. https://doi.org/10.1021/acs.jpcb.3c05282

Eric, V., Li, X., Dsouza, L. , Frehan, S. K. , Huijser, A., Holzwarth, A. R., Buda, F., Sevink, G. J. A., de Groot, H. J. M., & Jansen, T. L. C. (2023). Manifestation of hydrogen bonding and exciton delocalization on the absorption and two-dimensional electronic spectra of chlorosomes. The Journal of physical chemistry B, 127(5), 1097-1109. https://doi.org/10.1021/acs.jpcb.2c07143

Zhu, K. , Frehan, S. K. , Mul, G. , & Huijser, A. (2022). Dual Role of Surface Hydroxyl Groups in the Photodynamics and Performance of NiO-Based Photocathodes. Journal of the American Chemical Society, 144(24), 11010-11018. https://doi.org/10.1021/jacs.2c04301

Zhu, K. , Frehan, S. K., Jaros, A. , O'Neill, D. B. , Korterik, J. P. , Wenderich, K. , Mul, G. , & Huijser, A. (2021). Unraveling the Mechanisms of Beneficial Cu-Doping of NiO-Based Photocathodes. The Journal of physical chemistry C, 125(29), 16049-16058. https://doi.org/10.1021/acs.jpcc.1c03553

O'Neill, D. B. , Frehan, S. K. , Zhu, K., Zoethout, E. , Mul, G., Garnett, E. , Huijser, A., & Askes, S. (2021). Ultrafast photoinduced heat generation by plasmonic HfN nanoparticles. Advanced Optical Materials, 9(19), Article 2100510. https://doi.org/10.1002/adom.202100510

+31534898749

s.k.frehan@utwente.nl

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University of Twente
Drienerlolaan 5
7522 NB Enschede
The Netherlands

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University of Twente
P.O. Box 217
7500 AE Enschede
The Netherlands

University of Twente Drienerlolaan 5
7522 NB Enschede

+31 (0)53 489 9111
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