Geometry influence of the micro alkali vapor cell on the sensitivity of the chip-scale atomic magnetometers

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This paper focuses on geometry influence of the micro alkali vapor cell on the sensitivity of the chip-scale atomic magnetometers. For the first time, by using micro spherical alkali vapor cells instead of traditional micro planar alkali vapor cells, we demonstrate a chip-scale atomic magnetometer with a ten-fold improvement in sensitivity experimentally. Besides, results also show that the micro spherical cell has improved anti-relaxation properties, especially at low buffer gas pressure. The geometry of the micro vapor cell might also be important for the performance of other chip-scale atomic devices including chip-scale atomic clocks, vector atomic microwave electrometers and atomic gyroscopes.