CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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High Resolution Microwave B-Field Imaging Using a Micrometer-Sized Diamond Sensor |
Wen-Hao He1, Ming-Ming Dong1, Zhen-Zhong Hu1, Qi-Han Zhang2, Bo Yang1, Ying Liu1, Xiao-Long Fan2, Guan-Xiang Du1** |
1College of Telecommunication & Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210000 2School of Physical Science and Technology, Lanzhou University, Lanzhou 730000
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Cite this article: |
Wen-Hao He, Ming-Ming Dong, Zhen-Zhong Hu et al 2019 Chin. Phys. Lett. 36 127601 |
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Abstract We propose a diamond-based micron-scale sensor and perform high-resolution $B$-field imaging of the near-field distribution of coplanar waveguides. The sensor consists of diamond crystals attached to the tip of a tapered fiber with a physical size on the order of submicron. The amplitude of the $B$-field component $B$ is obtained by measuring the Rabi oscillation frequency. The result of Rabi sequence is fitted with a decayed sinusoidal. We apply the modulation-locking technique that demonstrates the vector-resolved field mapping of the micromachine coplanar waveguide structure (CPW). $B$-field line scan was performed on the CPW with a scan step size of 1.25 μm. To demonstrate vector resolved rf field sensing, a full field line scan acts (was performed) along four NV axes at a height of 50 μm above the device surface. The simulations are compared with the experimental results by vector-resolved measurement. This technique allows the measurement of weak microwave signals with a minimum resolvable modulation depth of 20 ppm. The sensor will have great interest in micron-scale resolved microwave $B$-field measurements, such as electromagnetic compatibility testing of microwave integrated circuits and characterization of integrated microwave components.
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Received: 24 September 2019
Published: 25 November 2019
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PACS: |
76.30.Mi
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(Color centers and other defects)
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76.70.Hb
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(Optically detected magnetic resonance (ODMR))
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Fund: Support by the Jiangsu Distinguished Professor Program under Grant No RK002STP15001, and the NJUPT Principal Distinguished Professor Program under Grant No NY214136. |
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