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High-resolution imaging of magnetic fields of banknote anti-counterfeiting strip using fiber diamond probe |
| Xu-Tong Zhao(赵旭彤)1, Fei-Yue He(何飞越)1, Ya-Wen Xue(薛雅文)2, Wen-Hao Ma(马文豪)1, Xiao-Han Yin(殷筱晗)1, Sheng-Kai Xia(夏圣开)3, Ming-Jing Zeng(曾明菁)4, and Guan-Xiang Du(杜关祥)1,† |
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 |
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Abstract 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 50 denomination 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.
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Received: 05 October 2023
Revised: 20 November 2023
Accepted manuscript online: 05 January 2024
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PACS:
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85.75.Ss
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(Magnetic field sensors using spin polarized transport)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB2012600) and the Shanghai Aerospace Science and Technology Innovation Fund, China (Grant No. SAST-2022-102). |
Corresponding Authors:
Guan-Xiang Du
E-mail: duguanxiang@njupt.edu.cn
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Cite this article:
Xu-Tong Zhao(赵旭彤), Fei-Yue He(何飞越), Ya-Wen Xue(薛雅文), Wen-Hao Ma(马文豪), Xiao-Han Yin(殷筱晗), Sheng-Kai Xia(夏圣开), Ming-Jing Zeng(曾明菁), and Guan-Xiang Du(杜关祥) High-resolution imaging of magnetic fields of banknote anti-counterfeiting strip using fiber diamond probe 2024 Chin. Phys. B 33 048502
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