Nano antenna-assisted quantum dots emission into high-index planar waveguide

X Yu (1) , Jean Claude Weeber (1) , Laurent Markey (1) , Juan-Miguel Arocas (1) , Alexandre Bouhelier (1) , Aymeric Leray (1) , Gérard Colas des Francs (1)

1 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne

Integrated quantum photonic circuits require the efficient coupling of photon sources to photonic waveguides. Hybrid plasmonic/photonic platforms are a promising approach, taking advantage of both plasmon modal confinement for efficient coupling to a nearby emitter and photonic circuitry for optical data transfer and processing. In this work, we established directional quantum dot (QD) emission coupling to a planar TiO 2 waveguide assisted by a Yagi-Uda antenna. Antenna on waveguide is first designed by scaling radio frequency dimensions to nano-optics, taking into account the hybrid plasmonic/photonic platform. Design is then optimized by full numerical simulations. We fabricate the antenna on a TiO 2 planar waveguide and deposit a few QDs close to the Yagi-Uda antenna. The optical characterization shows clear directional coupling originating from antenna effect. We estimate the coupling efficiency and directivity of the light emitted into the waveguide.

Domaines: Micro et nanotechnologies/Microélectronique; Optique / photonique

X Yu, Jean Claude Weeber, Laurent Markey, Juan-Miguel Arocas, Alexandre Bouhelier, et al.. Nano antenna-assisted quantum dots emission into high-index planar waveguide. Nanotechnology, 2024, 35 (26), pp.265201. ⟨10.1088/1361-6528/ad3742⟩. ⟨hal-04539940⟩