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IEEE International Conference on Signal, Information and Data Processing (ICSIDP)

Microwave magnetic field sensing based on Rabi resonance using Rb vapor cell with anti-relaxation coating

Ning Ru, Xiaochi Liu, Jifeng Qu

Published Dec 1, 2019• 0 citations
Publisher

Abstract

Using a detection technique of microwave (MW) magnetic field based on Rabi resonance, we have constructed a SI-traceable MW magnetic field sensor. Unlike the uncoated cylindrical Cs vapor cell filled with buffer gas presented in our previous work, here we developed an experimental setup based on an alkali vapor cell with anti-relaxation coating. Rabi resonance signal lineshape are successfully observed when alkali atoms interact with a phase-modulated MW field. Several experimental parameters, such as optical laser intensity and cell temperature, are detailly studied and characterized. The optimal amplitude of Rabi resonance lineshape were obtained, which is well-agreed with the theoretical model.

DOI
10.1109/icsidp47821.2019.9173425

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Using a detection technique of microwave (MW) magnetic field based on Rabi resonance, we have constructed a SI-traceable MW magnetic field sensor. Unlike the uncoated cylindrical Cs vapor cell filled with buffer gas presented in our previous work, here we developed an experimental setup based on an alkali vapor cell with anti-relaxation coating. Rabi resonance signal lineshape are successfully observed when alkali atoms interact with a phase-modulated MW field. Several experimental parameters, such as optical laser intensity and cell temperature, are detailly studied and characterized. The optimal amplitude of Rabi resonance lineshape were obtained, which is well-agreed with the theoretical model.
In this work, we demonstrate a microwave magnetic field imaging technique based on Rabi resonance with a cesium atom vapor cell. Rabi resonance signals are generated when atoms interact with a phase-modulated microwave (MW) field and are detected by a photodiode and camera. A low noise, high quantum efficiency camera is used to capture a series of frames for different phase modulation frequencies. Rabi frequencies of each spatial point in the field can be measured by scanning the frames. Thus, the strength of the MW magnetic field distribution is obtained by combing the Rabi frequencies, measured with camera pixels in the range of the probe laser beam. The simple architecture of this imaging setup holds great potential for the construction of compact/miniature MW field sensors for material testing, field imaging of MW components, and biomedical imaging.
The present Rabi resonance microwave sensing technique cannot fully describe the microwave magnetic field strength distribution due to the signal detection method. Here, we propose an alternative Rabi resonance-based microwave imaging technique using a digital micromirror device and an alkali atomic cell. The experimental results well describe the distribution of the microwave field quantitatively and agree with the absorption imaging results. This technique can also be used as a method to analyze and measure the relaxation rate in an atomic vapor cell and offers a SI-traceable imaging approach for the microwave magnetic field. Its simple architecture holds great potential for the development of compact/miniature microwave field sensors.
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In this paper we characterized the lineshapes of Rabi resonances for microwave (MW) magnetic field with cesium vapor cell in free space. The relation between resonance lineshapes and phase modulation frequency under different experimental parameters are investigated. Based on the obtained lineshapes, the evaluation of Rabi frequency has been done in free space. Optimal laser intensity and cell temperature are obtained in our experiment, preliminary analysis of the experimental results is reported.
As an important “tool” in microwave science and engineering, quantum sensing techniques have been studied in a broad range of fields such as microwave electrometry, microwave magnetic field detection. In this work, we measured the relaxation rate of Rb vapor cell with Rabi resonance-based quantum sensing technique in a microwave cavity. The characterization of Rabi resonance lineshape with different experimental parameters are investigated. The relaxation rate of the vapor cell could be obtained by the Rabi resonance lineshape.
As an important tool in microwave detection, quantum sensing techniques have been studied in a broad range of fields such as microwave electrometry and microwave magnetic field detection. In this work, we measure the relaxation rate of Rb atoms in vapor cells using a Rabi-resonance-based quantum sensing technique. The characterizations of the Rabi resonance line shape with different experimental parameters are investigated. The relaxation rate of the vapor cell can be obtained with the Rabi resonance line shape.