High-resolution imaging of magnetic fields of banknote anti-counterfeiting strip using fiber diamond probe  

作　　者：赵旭彤 何飞越 薛雅文 马文豪 殷筱晗 夏圣开 曾明菁 杜关祥 Xu-Tong Zhao;Fei-Yue He;Ya-Wen Xue;Wen-Hao Ma;Xiao-Han Yin;Sheng-Kai Xia;Ming-Jing Zeng;Guan-Xiang Du(College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;College of Science,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Bell Honors School,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [2]College of Science,Nanjing University of Posts and Telecommunications,Nanjing 210003,China [3]School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [4]Bell Honors School,Nanjing University of Posts and Telecommunications,Nanjing 210023,China

出　　处：《Chinese Physics B》2024年第4期720-727,共8页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (Grant No.2021YFB2012600);the Shanghai Aerospace Science and Technology Innovation Fund,China (Grant No.SAST-2022-102)。

摘　　要：Counterfeiting of modern banknotes poses a significant challenge,prompting the use of various preventive measures.One such measure is the magnetic anti-counterfeiting strip.However,due to its inherent weak magnetic properties,visualizing its magnetic distribution has been a longstanding challenge.In this work,we introduce an innovative method by using a fiber optic diamond probe,a highly sensitive quantum sensor designed specifically for detecting extremely weak magnetic fields.We employ this probe to achieve high-resolution imaging of the magnetic fields associated with the RMB 50denomination anti-counterfeiting strip.Additionally,we conduct computer simulations by using COMSOL Multiphysics software to deduce the potential geometric characteristics and material composition of the magnetic region within the anti-counterfeiting strip.The findings and method presented in this study hold broader significance,extending the RMB 50 denomination to various denominations of the Chinese currency and other items that employ magnetic anti-counterfeiting strips.These advances have the potential to significantly improve and promote security measures in order to prevent the banknotes from being counterfeited.

关 键 词：banknote anti-counterfeiting strip nitrogen-vacancy(NV)centers magnetic field imaging numerical simulation 

分 类 号：O441[理学—电磁学] TP391.41[理学—物理]