Publication date: 18th August 2023
In the search for better and more efficient light-emitting materials, additional strategies can be implemented to further enhance light generation. In this presentation, we consider the enhancement that can be provided by plasmonic nanostructures made of coinage metals. When electromagnetic radiation is shined upon such a nanoparticle whose size is much smaller than the wavelength of radiation, it induces charge oscillations known as plasmons. The resulting scattered light is tightly concentrated within tiny regions of space, which significantly enhances light-matter interaction when an emitter (fluorescent molecule, quantum dot) is placed in the vicinity of the nanoparticles. According to Fermi's golden rule, the transition probability for a two-level system is proportional to the transition dipole moment and the optical density of states, which is strongly influenced by the nanoparticle. In the weak coupling regime, we take a mere phenomenological approach and we model this transition as a classical dipole and obtain the density of states from electromagnetic calculations. We examine the enhancement of the radiative and non-radiative emission rates by placing such a dipole in the vicinity of a plasmonic nanoparticle and quantify their interaction using enhancement factors and quantum yield. This understanding is instrumental for designing efficient light-emitting devices with high quantum yields both in the visible and infrared domains.
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