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Séminaire de George Thomas

le 9 décembre 2019
De 11h à 12h

Excitons and plasmons: A tale of two elementary excitations and their interaction G. Thomas, Indian Institute of Science Education and Research Thiruvananthapuram

Coupling of elementary excitations in the presence of light results in several newer optical phenomena.1 The coupling can be categorized as strong, weak and very weak, depending on the magnitude of the interaction. We have earlier demonstrated several examples of these interactions and its consequence on their optical properties.1 Our group has recently demonstrated examples of exciton-exciton coupling in molecules, and plasmon-plasmon coupling in plasmonic systems by organizing them in asymmetric fashion.2-4 As a consequence of such interactions, several fascinating chiroptical properties emerge.2-4 These aspects, along with our recent results on the generation of plexcitonic states5 will be presented in the first part of the talk. Precise assembly of plasmonic materials of desired size and shape allows further modulation of their optical and field effects, opening up several plasmonically powered processes such as surface enhanced spectroscopy.6-9 We have translated the principles of surface-enhanced spectroscopy for the design of plasmonic platforms, which can identify molecules of importance in health, environment and safety.9 These aspects will be discussed.

Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Amphi Chemla, Institut d'Alembert

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