Magnetic-based Polydimethylsiloxane Microspheres for Magnetic Field Measurement

Bing Sun, Xinjiang Wang, Xiaobo Ma, Zhongyuan Sun, Zhiqiang Wang, Zuxing Zhang, Kaiming Zhou

Research output: Contribution to journalArticlepeer-review


Magnetic-based polydimethylsiloxane microspheres (MPMs) are fabricated and its applications for measurement of magnetic field are investigated. The MPMs are prepared by first incorporating the uniformly sized Mn3O4 nanocrystals into polydimethylsiloxane (PDMS) matrix, and then using a self-assembling method to obtain a chain of microspheres on the fiber taper. The MPMs are regarded as optical resonators, demonstrating whispering gallery modes (WGM) with a high Q factor in the 1310 nm band. Experimental results show that the resonance wavelengths of the WGM spectra depend on the strength of the magnetic field since the change in the applied filed cause the mechanical deformation of the MPMs, leading to a shift in the resonant wavelength of the resonator. Using as magnetic field sensors, the performances of the MPMs in terms of sensitivities and measurement ranges have been optimized. Thus, the sensitivity of 101.9 pm/mT and the measurement range up to 8 mT are achieved with a MPM (~270 μm in diameter). Besides, the performance of the MPM after two-week storage is analyzed, showing the excellent long-term stability.
Original languageEnglish
Article number9717300
JournalIEEE Transactions on Instrumentation and Measurement
Early online date9 Jun 2022
Publication statusPublished - 2022

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Funding: This work was supported in part by National Natural Science Foundation of
China under Grants 91950105 and 62175116, in part by Outstanding Chinese
and Foreign Youth Exchange Program of China Association for Science and
Technology (CAST), in part by the Jiangsu Province Science and Technology,
the Association Youth Science and Technology Talent Promotion, in part by
the 1311 Talents Program of Nanjing University of Posts and
Telecommunications (Dingxin), in part by National Postdoctoral Program for
Innovative Talents (BX201600077), in part by the Science Foundation of
Nanjing University of Posts and Telecommunications (NY219046), and in part
by China Postdoctoral Science Foundation (2017M611877), and in part by
Marie Skłodowska-Curie Individual Fellowships in the European Union’s Horizon 2020 Research and Innovation Programme under Grant 891685


  • Magnetic field measurement
  • Magnetic fields
  • Magnetic nanoparticles
  • Magnetic sensor
  • Manganese
  • Nanocrystals
  • Optical fiber sensor
  • Optical fiber sensors
  • Optical resonators
  • Polymer
  • Sensitivity
  • whispering gallery modes


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