Figure 1

The composite NVC-PW system consists of a 1D plasmonic waveguide and two identical NVCs in diamond nanocrystals, where the two red arrows denote the external laser driving on the NVCs.
The inset shows the level structure of a NVC, where the electronic ground state
is a spin triplet state and
is the level splitting induced by an external magnetic field B0 with γe the electron gyromagnetic ratio. The orange arrow denotes the coupling between NVC and PW.