The absorption due to phonon vibrations in graphene oxide quantum dots (GO-QDs) has been modified by localized plasmons induced by Ag nanoparticles (NPS). The interference of phonons and plasmons results in coherent interaction that leads to the formation of "dark states" and "coherent population trapping" related to Fano like effect. The localized electric field effectively drives the phonons which in turn modifies the coherent interaction in exciton absorption states of graphene oxide. A quantum optical theory is used to qualitatively explain the differential absorption spectra measured using pump-probe spectroscopy demonstrating the formation of dark states.
Meg Mahat, Yuri Rostovtsev, Sanjay Karna, Francis D'Souza, and Arup Neogi, "Plasmonic induced transparency in graphene oxide quantum dots," Proc. SPIE 10543, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XV, 105430N (Presented at SPIE OPTO: January 30, 2018; Published: 21 February 2018); https://doi.org/10.1117/12.2291084.
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