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Ultrastrong Plasmon-Exciton Coupling between Ag Nanoparticles and Conjugated Polymers

Strong light-matter interactions involving organic semiconductors are important for a number of technical applications, including low-threshold lasing [1] and room-temperature Bose-Einstein condensates [2]. Coupling between excitons in organic semiconductors and surface plasmons results in the formation of plasmon-exciton hybridized modes, which are observed as energetic splitting in the normal modes of the coupled system (i.e., Rabi splitting) [3]. Typically, excitons with narrow resonances, such as those found in. J-aggregates, are used to achieve strong coupling, where the rate of energy exchange between excitons and plasmons in the hybrid system exceeds the decay rates of the plasmons and excitons in the isolated systems. However, for many applications, including plasmon-enhanced photovoltaics, light- emitting diodes, and spasers, coupling between plasmons and excitons within conjugated polymers is of great interest [4-6].