Ultrafast photoluminescence and multiscale light amplification in nanoplasmonic cavity glass

• DOI: 10.1038/s41467-024-47539-3
• Publication Date: 2024-04-17T18:01:51Z
• Authors: Piotr Piotrowski; Marta Buza; Rafał Nowaczyński; Nuttawut Kongsuwan; Hańcza B. Surma; Paweł Osewski; Marcin Gajc; Adam Strzep; Witold Ryba-Roman...; Ortwin Hess; Dorota A. Pawlak
• Keywords: Structural Coloration

Interactions between plasmons and exciton nanoemitters in plexcitonic systems lead to fast intense luminescence, desirable optoelectonic devices, ultrafast optical switches quantum information science. While luminescence enhancement through exciton-plasmon coupling has thus far been mostly demonstrated micro- nanoscale structures, analogous demonstrations bulk materials have largely neglected. Here we present a nanocomposite glass doped with cadmium telluride dots (CdTe QDs) silver nanoparticles, nAg, which act as plasmon sources, respectively. This exhibits ultranarrow, FWHM = 13 nm, ultrafast, 90 ps, amplified photoluminescence (PL), λem≅503 at room temperature under continuous-wave excitation, λexc 405 nm. Numerical simulations confirm that the observed improvement emission is result of multiscale light owing ensemble QD-populated plasmonic nanocavities material. Power-dependent measurements indicate >100 mW coherent amplification occurs. These types plasmon-exciton composites could be designed comprising plethora components/functionalities, including emitters (QDs, rare earth transition metal ions) nanoplasmonic elements (Ag/Au/TCO, spherical/anisotropic/miscellaneous), achieve targeted applications.