Nanoscale axial position and orientation measurement of hexagonal boron nitride quantum emitters using a tunable nanophotonic environment

• URL: http://arxiv.org/abs/2007.07811v2
• Date: Tue, 23 Feb 2021 18:40:01 GMT
• Title: Nanoscale axial position and orientation measurement of hexagonal boron nitride quantum emitters using a tunable nanophotonic environment
• Authors: Pankaj K. Jha, Hamidreza Akbari, Yonghwi Kim, Souvik Biswas, Harry A. Atwater
• Abstract summary: Color centers in hexagonal boron nitride (hBN) have emerged as promising candidates for single-photon emitters (SPEs) In contrast to mono- and few-layered hBN, color centers in multi-layered flakes show superior emission characteristics. Our approach serves as a practical method to systematically characterize SPEs in hBN prior to integration in quantum photonics systems.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Color centers in hexagonal boron nitride (hBN) have emerged as promising candidates for single-photon emitters (SPEs) due to their bright emission characteristics at room temperature. In contrast to mono- and few-layered hBN, color centers in multi-layered flakes show superior emission characteristics such as higher saturation counts and spectral stability. Here, we report a method for determining both the axial position and three-dimensional dipole orientation of SPEs in thick hBN flakes by tuning the photonic local density of states using vanadium dioxide (VO2), a phase change material. Emitters under study exhibit a strong surface-normal dipole orientation, providing some insight on the atomic structure of hBN SPEs, deeply embedded in thick crystals. We have optimized a hot pickup technique to reproducibly transfer flakes of hBN from VO2 onto SiO2/Si substrate and relocated the same emitters. Our approach serves as a practical method to systematically characterize SPEs in hBN prior to integration in quantum photonics systems.

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