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Dr. Kalaivanan Nagarajan | Chemistry | Young Scientist Award

Tata Institute of Fundamental Research, Mumbai | India

Dr. Kalaivanan Nagarajan research focuses on exploring the fundamental and applied aspects of light–matter strong coupling, particularly vibrational strong coupling (VSC), to understand and manipulate chemical reactivity and material properties within optical cavities. By integrating principles from physical chemistry, quantum electrodynamics, and materials science, the work investigates how molecular vibrations interact coherently with confined optical modes in Fabry–Perot cavities to form hybrid light–matter states known as vibrational polaritons. These studies reveal how strong coupling conditions can reshape potential energy surfaces, influence molecular structure, dynamics, and reaction kinetics, and ultimately enable control of chemical transformations without the need for external photoexcitation. A key highlight of this research is the demonstration that VSC can modulate phase transition behaviors, such as the glass transition temperature of polymers like polyvinyl acetate and polystyrene, providing experimental evidence of cavity-modified thermomechanical properties. Through systematic spectroscopic, thermodynamic, and theoretical investigations, the research establishes how vacuum electromagnetic fields play an active role in determining material behavior and chemical outcomes. This pioneering approach contributes to the emerging field of polariton chemistry, offering new pathways for designing energy-efficient reactions, reactivity control strategies, and material innovations driven by quantum light–matter interactions.

Featured Publications

Thomas, A., Lethuillier-Karl, L., Nagarajan, K., Vergauwe, R. M. A., George, J., & Ebbesen, T. W. (2019). Tilting a ground-state reactivity landscape by vibrational strong coupling. Science, 363(6427), 615–619. https://doi.org/10.1126/science.aau7742

Nagarajan, K., Thomas, A., & Ebbesen, T. W. (2021). Chemistry under vibrational strong coupling. Journal of the American Chemical Society, 143(41), 16877–16889. https://doi.org/10.1021/jacs.1c07487

Sharma, P., Damien, D., Nagarajan, K., Shaijumon, M. M., & Hariharan, M. (2013). Perylene-polyimide-based organic electrode materials for rechargeable lithium batteries. The Journal of Physical Chemistry Letters, 4(19), 3192–3197. https://doi.org/10.1021/jz401590t

Vergauwe, R. M. A., Thomas, A., Nagarajan, K., Shalabney, A., George, J., & Ebbesen, T. W. (2019). Modification of enzyme activity by vibrational strong coupling of water. Angewandte Chemie International Edition, 58(43), 15324–15328. https://doi.org/10.1002/anie.201906346

 Nagarajan, K., Mallia, A. R., Muraleedharan, K., & Hariharan, M. (2017). Enhanced intersystem crossing in core-twisted aromatics. Chemical Science, 8(3), 1776–1782. https://doi.org/10.1039/C6SC04791E

 Banda, H., Damien, D., Nagarajan, K., Hariharan, M., & Shaijumon, M. M. (2015). A polyimide-based all-organic sodium ion battery. Journal of Materials Chemistry A, 3(19), 10453–10458. https://doi.org/10.1039/C5TA01921B

Thomas, A., Jayachandran, A., Lethuillier-Karl, L., Vergauwe, R. M. A., Nagarajan, K., George, J., & Ebbesen, T. W. (2020). Ground state chemistry under vibrational strong coupling: Dependence of thermodynamic parameters on the Rabi splitting energy. Nanophotonics, 9(2), 249–255. https://doi.org/10.1515/nanoph-2019-0357

Banda, H., Damien, D., Nagarajan, K., Raj, A., Hariharan, M., & Shaijumon, M. M. (2017). Twisted perylene diimides with tunable redox properties for organic sodium-ion batteries. Advanced Energy Materials, 7(20), 1701316. https://doi.org/10.1002/aenm.201701316

Kalaivanan Nagarajan | Chemistry | Young Scientist Award

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