High quality factor GaAs microcavity with buried bullseye defects
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The development of high quality factor solid-state microcavities with low mode volumes has paved the way towards on-chip cavity quantum electrodynamics experiments and the development of high-performance nanophotonic devices. Here, we report on the implementation of a new kind of solid-state vertical microcavity, which allows for confinement of the electromagnetic field in the lateral direction without deep etching. The confinement originates from a local elongation of the cavity layer imprinted in a shallow etch and epitaxial overgrowth technique. We show that it is possible to improve the quality factor of such microcavities by a specific in-plane bullseye geometry consisting of a set of concentric rings with sub wavelength dimensions. This design results in a smooth effective lateral photonic potential and therefore in a reduction of lateral scattering losses, which makes it highly appealing for experiments in the framework of exciton-polariton physics demanding tight spatial confinement.
Winkler , K , Gregersen , N , Häyrynen , T , Bradel , B , Schade , A , Emmerling , M , Kamp , M , Höfling , S & Schneider , C 2018 , ' High quality factor GaAs microcavity with buried bullseye defects ' Physical Review Materials , vol. 2 , no. 5 , 05220(R) . https://doi.org/10.1103/PhysRevMaterials.2.052201
Physical Review Materials
© 2018, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevMaterials.2.052201
DescriptionThe authors acknowledge financial support from the State of Bavaria, as well as from the DFG within the Project Schn1376/3.1: Polariton based single-photon sources, and from the Danish Research Council for Technology and Production (Sapere Aude LOQIT, DFF4005-00370).
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