GaAs droplet quantum dots with nanometer-thin capping layer for plasmonic applications

29 Oct 2017  ·  Park Suk In, Trojak Oliver Joe, Lee Eunhye, Song Jin Dong, Kyhm Jihoon, Han Ilki, Kim Jongsu, Yi Gyu-Chul, Sapienza Luca ·

We report on the growth and optical characterisation of droplet GaAs quantum dots with extremely-thin (11 nm) capping layers. To achieve such result, an internal thermal heating step is introduced during the growth and its role in the morphological properties of the quantum dots obtained is investigated via scanning electron and atomic force microscopy. Photoluminescence measurements at cryogenic temperatures show optically stable, sharp and bright emission from single quantum dots, at near-infrared wavelengths. Given the quality of their optical properties and the proximity to the surface, such emitters are ideal candidates for the investigation of near field effects, like the coupling to plasmonic modes, in order to strongly control the directionality of the emission and/or the spontaneous emission rate, crucial parameters for quantum photonic applications.

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Optics Mesoscale and Nanoscale Physics Materials Science Applied Physics Quantum Physics