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YANG Zongmeng, XING Qian, CHEN Yian, HOU Yumin. Improving sensitivity by multi-coherence of magnetic surface plasmons[J]. Chinese Optics. doi: 10.37188/CO.EN.2022-0009
Citation: YANG Zongmeng, XING Qian, CHEN Yian, HOU Yumin. Improving sensitivity by multi-coherence of magnetic surface plasmons[J]. Chinese Optics. doi: 10.37188/CO.EN.2022-0009

Improving sensitivity by multi-coherence of magnetic surface plasmons

doi: 10.37188/CO.EN.2022-0009
Funds:  Supported by National Natural Science Foundation of China (No. 61575006)
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  • Author Bio:

    Zongmeng Yang (1996—), male, born in Daqing, Heilongjiang, is now a master candidate in the School of physics, Beijing University, maily engaged in the research of coherence of surface plasmons. E-mail: zemelyang@pku.edu.cn

    Yumin Hou, female, born in Shandong Province, Ph.D, now is a asocciate professor in the School of physics, Beijing University, mainly engaged in the research of surface plasmons recently. E-mail: ymhou@pku.edu.cn

  • Corresponding author: ymhou@pku.edu.cn
  • Received Date: 03 Jan 2020
  • Accepted Date: 01 Aug 2022
  • Rev Recd Date: 05 Jan 2020
  • Available Online: 24 Aug 2022
  • This paper studies the coherence of magnetic surface plasmons in one-dimensional metallic nano-slit arrays and proposes a double-dip sensing method to improve sensitivity. Different from the conventional way of scanning wavelength at a fixed incident angle, coherence of surface plasmons is investigated by changing the incident angle at a fixed wavelength. Due to the retardation effect, two coherence dips move in opposite directions as the refractive index of the surrounding medium changes. Compared with one dip used for sensing, two oppositely moving dips can efficiently improve the sensitivity. The sensitivity of two dips can reach 141.6°/RIU while the sensitivities of two single dips are 39.2°/RIU and 102.4°/RIU respectively. Besides, the inconsistency between the refractive index of slit medium and upper medium has few influences on the sensing performance, which can lead to wide practical applications.


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