Abstract
Abstract We report a numerical simulation on the coupling of chromium-vacancy centers in nanodiamond (CrV-ND) with end-to-end aligned optical nanowires (ONWs) structure. The structure is designed using finite-difference time-domain simulations to maximize the bidirectional coupling of spontaneous emission from a CrV-ND into ONW-guided modes. We systematically analyze the dependence of spontaneous emission characteristics on the ONW and CrV-ND dimension, quantum emitter (QE) position, and polarization. We show that coupling efficiency as high as 62% can be achieved into the guided modes from a CrV-ND placed at the center of ONWs, which is twice as compared to a CrV-ND placed on an ONW surface. The degree of polarization of single photons from CrV-ND is also estimated to be as high as 64%. This simple device can be reconfigured for various QEs. This present fiber inline platform may open new avenues in quantum photonics.
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