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Low crosstalk hybrid fiber optic sensor based on surface plasmon resonance and MMI

This Letter proposes a hybrid fiber optic sensor based on surface plasmon resonance (SPR) and multimode interference (MMI). The sensor consists of a single-mode fiber-no-core fiber-single-mode fiber (SMF-NCF-SMF) structure with a partially deposited gold film layer. When compared with the previous studies, the main contribution of this Letter is the introduction of MMI into the SPR sensors; hence, both the SPR and the MMI mechanisms are excited in a single sensor structure for the dual-parameter measurement. The measurement process is realized based on two individual sensing mechanisms and the separated spectral regions (visible or near-infrared); therefore, the crosstalk between the two measured parameters is largely suppressed and has been verified experimentally insignificant. Furthermore, the obvious interference effect can be used to measure a great number of physical parameters; hence, the proposed hybrid fiber optic sensor provides an important supplement to the traditional SPR function.