| Citation: | YANG Zong-meng, XING Qian, CHEN Yi-an, HOU Yu-min. Improving sensitivity by multi-coherence of magnetic surface plasmons[J]. Chinese Optics, 2023, 16(2): 458-465. doi: 10.37188/CO.EN.2022-0009
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In this paper, we study the coherence of magnetic surface plasmons in one-dimensional metallic nano-slit arrays and propose 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 total 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 will have wide practical applications.
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