Seminarium Fizyki Ciała Stałego

The tunability of light-matter coupling allows for the observation of various physical phenomena ranging from spontaneous emission enhancement via the Purcell effect (in the weak coupling regime) to Bose-Einstein condensation of exciton-polaritons (strong coupling regime). With the aim to investigate and implement these interactions in the practical optoelectronic devices, we demonstrate integration of the plasmonic structures supporting highly localized electric fields into the light-emitting field-effect transistors. As the planar electroluminescent devices, they enable direct voltage-controlled lateral localization of the emission zone and thus deliberate near-field coupling to the plasmonic nanocavities, e.g., gold nanorods and periodically arranged nanodisks [1]. Apart from being an example of the electrically driven source of plasmons, our approach allows significant enhancement of near-IR (~1000-1500 nm) photo- and electroluminescence, spectral-tunability and tailored far-field light emission patterns of solution-processable polymers and semiconducting single-walled carbon nanotubes [2-4]. For the light-matter coupling strength exceeding the overall decay rate, we achieve strong coupling regime and the formation of new quasiparticles, plasmon-exciton polaritons [5]. The appearance of spatial coherence between emitters coupled to these nanocavities may potentially enable observation of the plasmonic Dicke effect and generation of entanglement. Further optimization of the design and configuration of plasmon-exciton coupling will contribute to the development of practical quantum technologies and low-power/energy optoelectronic components.

References[1] Y. Zakharko, et al., ACS Photonics 3, 1 (2016).[2] Y. Zakharko, et al., Optics Express 25, 18092 (2017).[3] Y. Zakharko, et al., ACS Photonics 3, 2225 (2016).[4] Y. Zakharko, et al., Nano Lett. 16, 3278 (2016).[5] Y. Zakharko, et al., Nano Lett. 16, 6504 (2016).