Figure 3 ,Table 0个

    • Figure 1.  (a) When there is no DC magnetic field, there is a zero-field split D = 2.87 GHz between ms = 0 and ms = ±1. According to the transition selection rules of dipoles, the transitions between the ms = 0 and ms = ±1 states are driven by the σ±, circularly polarized components of the MW fields, respectively (σ− stands for right circular polarization, while σ+ stands for left circular polarization). (b) The S parameter of coplanar waveguide. Coplanar waveguide has stable and uniform electromagnetic characteristics in the wide band, and is used as a representative RF device in the experiments and simulations of this work. (c) Tapered fiber diamond probe. The red part of the figure represents NV center ensemble, which can reach submicron size and thus obtain submicron resolution. (d) Bulk diamond with confocal microscope and CCD camera. By taking pictures, two-dimensional (2D) field distribution can be quickly scanned.

    • Figure 2.  (a) Typical ODMR spectrum showing four resonance peaks of NV center. The two outer peaks represent the well-oriented NV axis, and the frequency difference between the two peaks is proportional to the strength of the applied DC magnetic field. The two peaks in the middle are formed by overlapping the six peaks of the other three axes, which have equal angles to the DC magnetic field and thus equal frequencies of the peaks. (b) Typical Rabi oscillation. The fluorescence intensity of NV color center changes periodically with the increase of microwave duration. After the fluorescence signal enters the avalanche photodiode, it is reflected as a change in the output electric signal. (c) The distribution of the horizontal component of MW magnetic field above CPW in the Z direction at the frequency of 3.39 GHz. (d) The distribution of the horizontal component of MW magnetic field above CPW in the X direction at the frequency of 3.39 GHz (25 μm upper from the CPW’s surface).

    • Figure 3.  (a) The amplitude of Hx before and after adding bulk diamond and the corresponding ROC. (b) The ROC of S21 after adding bulk diamond. (c) The amplitude of Hx before and after adding FDP and the corresponding ROC. (d) The ROC of S21 after adding FDP.