Lens-shaped all-epitaxial quantum dot microcavity

Data are presented on a new type of microcavity that uses epitaxial overgrowth to localize self-organized quantum dots in a microcavity optical mode. The all-epitaxial design eliminates free surfaces from the active material, eliminates quantum dots from the mirror and passive cavity regions, and provides a mechanically robust design with high thermal conductivity. The epitaxial overgrowth leads to a new type of lens-shaped microcavity, while the mesa confinement leads to lithographically defined placement of the quantum dots near the center of the optical mode.