Sensitivity enhanced interferometric optical sensor of taper-in-taper structure for heavy metal ions detection

Jie Zhang; Yisong Lei; Zhao Liu; Zeji Sun; Yuyao Li; Xianqi Su; Zesen Su; Zidan Gong

doi:10.1117/12.2674125

9 March 2023 Sensitivity enhanced interferometric optical sensor of taper-in-taper structure for heavy metal ions detection

Jie Zhang, Yisong Lei, Zhao Liu, Zeji Sun, Yuyao Li, Xianqi Su, Zesen Su, Zidan Gong

Author Affiliations +

Proceedings Volume 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022); 126000T (2023) https://doi.org/10.1117/12.2674125
Event: 2022 International Conference on Optoelectronic Materials and Devices, 2022, Chongqing, China

Abstract

Heavy metal pollution in water resource is a serious issue that related to the ecosystem and the health status of human beings. Although there existed many detection methods, it is still difficult to create a device with ultrahigh sensitivity to detect heavy metal ions in situations with low concentrations. This paper proposed a taper-in-taper (T-I-T) interferometric fiber sensor of enhanced sensitivity and decorated with polyelectrolyte layers for Cu²⁺ detection. The T-I-T structure was created on the single-mode fiber via twice arc discharges. The maximum refractive index (RI) sensitivity of T-I-T fiber sensor is as high as 4170 nm/RIU, meanwhile, when apply in heavy metal ions detection, the sensitivity can reach 10.4 nm/ mM when the Cu²⁺ concentration is 0.1-1 mM. Furthermore, there is a low temperature cross sensitivity of only 0.12 nm/°C. The proposed T-I-T fiber sensor has the potential to be applied in water resource environmental monitoring due to its benefits of high sensitivity, compact structure, and excellent stability.

Citation Download Citation

Jie Zhang, Yisong Lei, Zhao Liu, Zeji Sun, Yuyao Li, Xianqi Su, Zesen Su, and Zidan Gong "Sensitivity enhanced interferometric optical sensor of taper-in-taper structure for heavy metal ions detection", Proc. SPIE 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022), 126000T (9 March 2023); https://doi.org/10.1117/12.2674125

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