Resolution limit of mode-localised sensors

Abstract

In recent years, the mode localisation phenomenon of weakly coupled resonators has been successfully utilised to improve the sensitivity of microelectromechanical system (MEMS) sensors. However, controversy remians about the resolution limits of mode-localised sensors. This paper asks two questions of the community: what are the resolution limits of the mode-localised sensors, and can the resolution improvement be obtained using mode-localised sensing? To answer these questions, we report a series of resolution models of mode-localised sensors. We conclude that mode-localised sensing can realise a higher measuring resolution by orders of magnitude when more than three resonators are weakly coupled, and this will lay the theoretical foundation for a breakthrough for the MEMS sensors industry.

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Acknowledgements

This work was supported by National Key Research and Development Program of China (Grant No. 2018YFB2002600), National Natural Science Foundation of China (Grant No. 51575454), and Fundamental Research Funds for the Central Universities (Grant No. 3102019JC002). The author would like to show grateful acknowledgment to H. Kang and J. Yang for their helpful discussion.

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Correspondence to Honglong Chang.

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Zhang, Z., Chang, H. Resolution limit of mode-localised sensors. Sci. China Inf. Sci. 64, 142401 (2021). https://doi.org/10.1007/s11432-020-2974-9

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Keywords

  • MEMS
  • mode-localised sensors
  • resolution limit
  • 2-degree-of-freedom
  • higher degree-of-freedom