Research on sensitivity enhancement techniques for nitrogen-vacancy center magnetometers based on efficient fluorescence collection
In recent years,the integration of diamond nitrogen-vacancy(NV)center magnetometers has garnered widespread ac-ademic attention.However,the development of highly sensitive integrated magnetometers has been hindered by the low fluorescence collection efficiency.To address this issue,innovative approaches involving the introduction of diamond surface magnetron sputtering reflective coatings and sidewall angle-cutting techniques have been employed,effectively enhancing the fluorescence collection effi-ciency from 34.2％ to 67.9％.The processed diamond was integrated into a magnetometer probe within a volume of 2.9×2.1×2 cm3.Test results demonstrate that within the same volume of the magnetometer,the application of angle cutting and coating techniques has elevated the sensitivity of the magnetometer from 21.3 nT/Hz1/2 to 5.7 nT/Hz1/2.Thus,through the enhancement of fluorescence in-tensity collection via angle cutting and coating,the sensitivity of integrated diamond NV center magnetometers has been improved.
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维普
