Using Diamond Quantum Magnetometer to Characterize Near-Field Distribution of Patch Antenna

Quantum near field probe for integrated circuits electromagnetic interference at wafer level

“…The chip scanning imaging system we designed mainly includes optical part and electronic control part. 18,19 The optical part, which is used to complete the transmission and conversion of optical signals, is made up of a 532 nm pulsed laser, mirrors, objective lens, an avalanche photoelectric diode (APD) and other optical components. The electronic control part is composed of a pulse generator, a microwave signal source, a spectrum analyzer and a computer, which is used for data acquisition, analysis and the processing of optoelectronic signals, and to realize the high-resolution raster scanning imaging by motorized stages.…”

“…With the zero-field splitting 2.87 GHz as the boundary, the resonance peaks on the right side correspond to the qubits transition between m s = 0 and m s = +1, which is sensitive to a left-hand circularly polarized component of the microwave field projection on the axial plane of NV axes; the resonance peaks on the left side correspond to the spin states transition between m s = 0 and m s = À1, which is sensitive to a right-hand circularly polarized component of the microwave field projection on the axial plane of NV axes. 18 Taking the two-level system of m s = 0 and m s = +1 as an example, by applying microwave signal to it, we can change the population of m s = 0 and m s = +1, namely the distribution of extranuclear electrons. If the microwave frequency meets the resonance frequency, the atoms in the two-level system will constantly transit between the two levels, presenting oscillatory change in the state distribution in statistics.…”

Diamond nitrogen‐vacancy centres spin‐state‐based quantum sensor using a compact broadband antenna

“…Its structure (Figure 1a) is that one carbon atom in diamond is replaced by a nitrogen atom, and another adjacent carbon atom is missing. Under the excitation of green laser and microwave field, the qubit resonance [3] of the NV centre can be obtained by receiving the optically detected fluorescence generated by the electron spin transition. The Zeeman splitting [1] can also be observed from the fluorescence spectrum, which magnetic field can be measured (Figure 1b).…”

“…The Zeeman splitting [1] can also be observed from the fluorescence spectrum, which magnetic field can be measured (Figure 1b). This usually used the optically detected magnetic resonance (ODMR) [3] method for the diamond NV centres‐based magnetic field sensor.…”

Efficient Identifying the Orientation of Single NV Centers in Diamond and Using them to Detect Near Field Microwave

“…39,40 Therefore, on the condition of resonance, the power of MW near field can be indirectly read out by measuring the fluorescence intensity change of the NV centers. 19,41 Utilizing the five NV centers with the same orientation identified above, the relative component of the MW field amplitude in a plane perpendicular to the NV axis B M W ⊥ was studied by measuring the fluorescence intensity and Rabi oscillation frequency Ω. 1 mW ), which indicated the distribution of MW near field is not simply linearity with the distance of the antenna.…”