Abstract
This paper presents designs of nano-cavity structures based on a photonic crystal in diamond in order to achieve high-efficiency collection of zero-phonon line (ZPL) photons emitted from the nitrogen-vacancy centers in diamond. The cutoff radius is calculated so as to ensure that the dual-resonances for both the pump and the ZPL photons could exist in the designed cavities. Our conceptual designs are demonstrated through simulations by finite-difference time-domain (FDTD) method. High Q for the pump (∼1.9148×105), strong enhancement of spontaneous emission in terms of Purcell factor (∼3812.1), and high coupling efficiencies for pump and for ZPL output (∼94.06% and 92.19% respectively) could be numerically obtained, which may make our designs applicable in quantum-optical information processing systems such as quantum nodes or quantum repeaters.
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