2020/07/15 by Pankaj K. Jha, Jha, Pankaj K., Hamidreza Akbari +7 · 2 citations
Materials Science · Engineering · Physics and Astronomy · #Diamond and Carbon-based Materials Research #Nonlinear Optical Materials Studies #Advanced Fiber Laser Technologies
paper · pdf · doi:10.48550/arxiv.2007.07811
Color centers in hexagonal boron nitride (hBN) have emerged as promising\ncandidates for single-photon emitters (SPEs) due to their bright emission\ncharacteristics at room temperature. In contrast to mono- and few-layered hBN,\ncolor centers in multi-layered flakes show superior emission characteristics\nsuch as higher saturation counts and spectral stability. Here, we report a\nmethod for determining both the axial position and three-dimensional dipole\norientation of SPEs in thick hBN flakes by tuning the photonic local density of\nstates using vanadium dioxide (VO2), a phase change material. Emitters under\nstudy exhibit a strong surface-normal dipole orientation, providing some\ninsight on the atomic structure of hBN SPEs, deeply embedded in thick crystals.\nWe have optimized a hot pickup technique to reproducibly transfer flakes of hBN\nfrom VO2 onto SiO2/Si substrate and relocated the same emitters. Our approach\nserves as a practical method to systematically characterize SPEs in hBN prior\nto integration in quantum photonics systems.\n