Abstract
Efficient integration of a single-photon emitter with an optical waveguide is essential for quantum integrated circuits. In this study, we integrated a single-photon emitter in a hexagonal boron nitride (h-BN) flake with a Ag plasmonic waveguide and measured its optical properties at room temperature. First, we performed numerical simulations to calculate the efficiency of light coupling from the emitter to the Ag plasmonic waveguide, depending on the position and polarization of the emitter. In the experiment, we placed a Ag nanowire, which acted as the plasmonic waveguide, near the defect of the h-BN, which acted as the single-photon emitter. The position and direction of the nanowire were precisely controlled using a stamping method. Our time-resolved photoluminescence measurement showed that the single-photon emission from the h-BN flake was enhanced to almost twice the intensity as a result of the coupling with the Ag nanowire. We expect these results to pave the way for the practical implementation of on-chip nanoscale quantum plasmonic integrated circuits.
Highlights
Efficient coupling of a single-photon emitter with an optical waveguide is essential for implementing a quantum photonic integrated circuit [1]
The positions of metal nanowires and metal nanoparticles have been controlled by using an atomic force microscopy (AFM) tip to couple them with single-photon emitters such as nanodiamonds containing color centers [13,14,15], quantum dots [16], and defects in hexagonal boron nitride (h-BN) [17]
We demonstrate efficient coupling between the single-photon emitter in h-BN and a plasmonic waveguide in the form of a Ag nanowire
Summary
Efficient coupling of a single-photon emitter with an optical waveguide is essential for implementing a quantum photonic integrated circuit [1]. When the single-photon emitter is coupled to a plasmonic waveguide, the local density of states (LDOS) of the emitter is increased, and the photon emission is enhanced [2,3,4,5,6,7,8]. This feature was observed by integrating single-photon emitters with randomly dispersed metal nanowires on a substrate [9,10,11,12]. Alignment of the plasmonic waveguide at an accurate angle is necessary to investigate the polarization dependence of the single-photon emitter on the efficiency of coupling with the plasmonic waveguide, which has yet to be demonstrated
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