Coupling an epitaxial quantum dot a fiber-based external-mirror microcavity

Single InAs semiconductor quantum dots were coupled to an open optical microcavity. It consists of a Bragg reflector grown underneath the quantum dot layer, and a micromirror external to the semiconductor sample. This cavity is fully spectrally tunable with a piezoelectric actuator and a single quantum dot can be conveniently positioned at an antinode of the cavity field. Fabrication of the micromirror at the tip of a single-mode fiber permits efficient light collection into a well-defined collection mode.