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- ItemGain and lasing from CdSe/CdS nanoplatelet stripe waveguides(Amsterdam : Elsevier, 2022) Belitsch, Martin; Dirin, Dmitry N.; Kovalenko, Maksym V.; Pichler, Kevin; Rotter, Stefan; Ghalgaoui, Ahmed; Ditlbacher, Harald; Hohenau, Andreas; Krenn, Joachim R.Colloidal semiconducting nanocrystals are efficient, stable and spectrally tunable emitters, but achievable optical gain is often limited by fast nonradiative processes. These processes are strongly suppressed in slab-shaped nanocrystals (nanoplatelets), due to relaxed exciton Coulomb interaction. Here, we show that CdSe/CdS nanoplatelets can be engineered into (sub)microscopic stripe waveguides that achieve lasing without further components for feedback, i.e., just relying on the stripe end reflection. We find a remarkably high gain factor for the CdSe/CdS nanoplatelets of 1630 cm−1. In addition, by comparison with numerical simulations we assign a distinct emission peak broadening above laser threshold to emission pulse shortening. Our results illustrate the feasibility of geometrically simple monolithic microscale nanoplatelet lasers as an attractive option for a variety of photonic applications.