Determination of the Dipole Orientation of a Single Defect in Hexagonal Boron Nitride using Vector Beam

Solid-state single light emitters are of great interest in photonic and quantum devices, such as bio-sensors, low threshold lasers, and single photon sources. In particular, the defects in hexagonal boron nitrides (hBNs) have recently attracted a lot of attention as novel single light emitters for such devices, owing to their high brightness, high robustness, and a narrow emission linewidth at room temperature. In order to realize those devices, it is important to determine the dipole orientation on the level of single defects. Here, we report on the three-dimensional determination of the orientation of the single defects using a vector beam.