We investigate ultrafast energy transfer between excitons and plasmons in ensembles of core-shell type nanoparticles consisting of metal core covered with a concentric thin J-aggregate (JA) shell. The high electric field localization by the Ag nanoprisms and the high oscillator strength of the JAs allow us to probe this interaction in the ultrastrong plasmon-exciton coupling regime. Linear and nonlinear optical properties of the coupled system have been measured using transient absorption spectroscopy revealing that the hybrid system shows half-plasmonic and half-excitonic properties. The tunability of the nanoprism plasmon resonance provides a flexible platform to study the dynamics of the hybrid state in a broad range of wavelengths.
Probing ultrafast energy transfer between excitons and plasmons in the ultrastrong coupling regime
Sinan Balci, Coskun Kocabas, Betül Küçüköz, Ahmet Karatay, Elif Akhüseyin, H. Gul Yaglioglu, Ayhan Elmali; Probing ultrafast energy transfer between excitons and plasmons in the ultrastrong coupling regime. Appl. Phys. Lett. 4 August 2014; 105 (5): 051105. https://doi.org/10.1063/1.4892360
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