AI Article Synopsis
- The study focuses on improving the radiative properties of light emitters using surface plasmons, which is crucial for developing nanoscale optoelectronic devices like lasers and detectors.
- The researchers achieved significant enhancement of hot-exciton emission, which comes from non-thermalized excitons, by utilizing resonant whispering-gallery plasmonic nanocavities in core-shell nanowire devices.
- By optimizing the size of these plasmonic cavities, they observed a dramatic increase in radiative rates and extremely short lifetimes of excitons, potentially leading to advancements in ultrafast nanophotonic technologies.
Article Abstract
The manipulation of radiative properties of light emitters coupled with surface plasmons is important for engineering new nanoscale optoelectronic devices, including lasers, detectors and single photon emitters. However, so far the radiative rates of excited states in semiconductors and molecular systems have been enhanced only moderately, typically by a factor of 10-50, producing emission mostly from thermalized excitons. Here, we show the generation of dominant hot-exciton emission, that is, luminescence from non-thermalized excitons that are enhanced by the highly concentrated electromagnetic fields supported by the resonant whispering-gallery plasmonic nanocavities of CdS-SiO(2)-Ag core-shell nanowire devices. By tuning the plasmonic cavity size to match the whispering-gallery resonances, an almost complete transition from thermalized exciton to hot-exciton emission can be achieved, which reflects exceptionally high radiative rate enhancement of >10(3) and sub-picosecond lifetimes. Core-shell plasmonic nanowires are an ideal test bed for studying and controlling strong plasmon-exciton interaction at the nanoscale and opens new avenues for applications in ultrafast nanophotonic devices.
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