Method for direct coupling of a semiconductor quantum dot to an optical fiber for single-photon source applications.

We present an effective method for direct fiber coupling of a quantum dot (QD) that is deterministically incorporated into a cylindrical mesa. For precise positioning of the fiber with respect to the QD-mesa, we use a scanning procedure relying on interference of light reflected back from the fiber end-face and the top surface of the mesa, applicable for both single-mode and multi-mode fibers. The central part of the fiber end-face is etched to control the required distance between the top surface of the mesa and the fiber core.

Afterglow, TL and OSL properties of Mn-doped ZnGaO phosphor.

Zinc gallate (ZnGaO) spinel ceramics doped with Mn ions was prepared by a solid-state reaction at 1200 °C in air. Manganese concentration was equal to 0.05 mol.