Talk given by Dr. Yuriy Zakharko Institute for Physical Chemistry Universität Heidelberg Heidelberg, Germany Abstract: The ability to tune the coupling strength between excitons and electromagnetic fields enables the observation and utilization 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 (in the 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 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 plasmonic structures, e.g. gold nanorods and periodically arranged nanodisks (ACS Photonics 2016, 3, 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-/electroluminescence, spectral-tunability and tailored far-field light emission patterns of solution-processable polymers and semiconducting single-walled carbon nanotubes (Nano Lett. 2016, 16, 3278). For the devices with plasmon-exciton coupling larger than the overall decay rate, we achieve strong coupling regime and the formation of plasmon-exciton polaritons. The appearance of spatial coherence between emitters coupled to plasmonic crystal may potentially enable observation of the plasmonic Dicke effect and generation of entanglement between emitters. 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.

This event is part of the eventgroup INT Talks

Homepage
https://www.int.kit.edu/events.php

Speaker
Dr. Yuriy Zakharko

Institute for Physical Chemistry Universität Heidelberg
http://www.pci.uni-heidelberg.de/apc/staff/zakharko_cv.html

Organizer
Prof. Dr. Martin Wegener
Angewandte Physik und Institut für Nanotechnologie
Karlsruher Institut für Technologie (KIT)
Karlsruhe
Mail: martin wegener ∂does-not-exist.kit edu
https://www.aph.kit.edu/wegener/

Targetgroup
Interested / Everyone