High-sensitivity and wide-bandwidth fiber-coupled diamond magnetometer with surface coating  

作　　者：SHAO-CHUN ZHANG HAO-BIN LIN YANG DONG BO DU XUE-DONG GAO CUI YU ZHI-HONG FENG XIANG-DONG CHEN GUANG-CAN GUO FANG-WEN SUN 

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center For Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]National Key Laboratory of ASIC,Hebei Semiconductor Research Institute,Shijiazhuang 050051,China

出　　处：《Photonics Research》2022年第9期2191-2201,共11页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2017YFA0304504);Science Challenge Project(TZ2018003);National Natural Science Foundation of China(12005218,91850102);Anhui Initiative in Quantum Information Technologies(AHY130000);Fundamental Research Funds for the Central Universities(WK2030000020)。

摘　　要：Mapping magnetic fields from different materials and structures can provide a powerful means for broad applications of activity probe and feature analysis.Here,we present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer at the scale of a few hundred micrometers.We propose a fiber-coupled diamond magnetometer.Tracking a pulsed optically detected magnetic resonance spectrum allows a magnetic field sensitivity of 103 pT∕■and a bandwidth of 2.6 k Hz.Additionally,with an approach of coating the diamond surface with silver reflective film,both the fluorescence collection and excitation efficiency are significantly enhanced,and the sensitivity and bandwidth are expected to be further improved to 50 pT∕■and 4.1 k Hz,respectively.Finally,this fiber-based quantum magnetometer is applied as a probe to successfully map the magnetic field induced by the current-carrying copper-wire mesh.Such a stable and compact magnetometer can provide a powerful tool in many areas of physical,chemical,and biological researches.

关 键 词：coating MAGNETOMETER FIBER 

分 类 号：TM936[电气工程—电力电子与电力传动]