Enhanced sensitivity of heterocore structure surface plasmon resonance sensors based on local microstructures

Wenjie Zhu; Qing Huang; Yong Wang; Elfed Lewis; Minghong Yang

doi:10.1117/1.OE.57.7.076105

25 July 2018 Enhanced sensitivity of heterocore structure surface plasmon resonance sensors based on local microstructures

Wenjie Zhu, Qing Huang, Yong Wang, Elfed Lewis, Minghong Yang

Author Affiliations +

Optical Engineering, Vol. 57, Issue 7, 076105 (July 2018). https://doi.org/10.1117/1.OE.57.7.076105

Abstract

A method to improve the refractive index (RI) and temperature sensitivities of optical fiber based on surface plasmon resonance (SPR) sensors is proposed and experimentally demonstrated. It is realized by using a precision femtosecond laser system to manufacture microstructures on a heterocore optical fiber structure (multimode single-mode multimode fiber, MSM). The microstructured MSM structure fiber-optic sensors were coated with 60-nm gold (Au) film to test and verify RI sensing, obtaining an enhancement of the maximum sensitivity range from 2845.18 to 3313.15 nm/RIU. The fabricated sensors were additionally coated with a layer of polydimethylsiloxane, which has a high negative thermos-optic coefficient, to conduct a series of temperature sensing experiments. Experimental results showed that the maximum sensitivity increased from 1.1998 to 1.5646 nm/°C. Compared with nonmicrostructured sensors, the RI and temperature sensitivity of the proposed sensor has increased 16.4% and 30.2%, respectively. The simply fabricated, low-cost, and high-sensitivity SPR sensor has promising applications in many areas, especially in the biochemical field.

Citation Download Citation

Wenjie Zhu, Qing Huang, Yong Wang, Elfed Lewis, and Minghong Yang "Enhanced sensitivity of heterocore structure surface plasmon resonance sensors based on local microstructures," Optical Engineering 57(7), 076105 (25 July 2018). https://doi.org/10.1117/1.OE.57.7.076105

Received: 11 March 2018; Accepted: 25 June 2018; Published: 25 July 2018

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