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The near-field interaction due to a strong electromagnetic field induced byresonant localized plasmons can result in a strong coupling of excitonic statesor formation of hybrid exciton-plasmon modes in quantum confined structures.This coupling can be strengthed by designing a system with its vibronic statesresonant to the energy of the driving field induced by the localized plasmonexcitation. Silver nanoislands nucleated on molybdenum disulfide (MoS2) is anideal platform for such interaction. The influence of localized plasmons (LSP)on the formation and dissociation of excitons due to resonant and off-resonantoptical excitation of carriers to excitonic states is studied using ultrafastoptical spectroscopy. The local field due to the Ag nanoparticles (Ag-NP)enhances the magnitude of the Raman modes in MoS2 in the presence of resonantexcitation. An ultrashort pulsed optical excitation at 2.3 eV resonantlyexcites the LSP modes and the optical near-field resonantly drive the phononmodes, which leads to a coherent coupling of the A and B excitons in MoS2 withthe plasmon modes. The resonant excitation of the LSP modes modulate theoptical absorption of the probe field. The resonant excitation of C exciton dueto an excitation source at 3.0 eV, which is off-resonant to the LSP modeincreases the electrostatic screening in the presence of excess carriers fromAg NPs. It results in a faster dissociation of optically generated C excitonsinto free carriers that eventually increase the A and B exciton population. A3-level density matrix theory in the presence of dressed vibronic statesinduced by a localized near-field optical driving source is applied to describethe coherent interaction process in the hybrid nano-plasmonic system.

Active control of coherent dynamics in hybrid plasmonic MoS2 monolayers with dressed phonons