ZHANG Shuli, WANG Zhan, YANG Xianchao. Research of D-shaped optical fiber sensor with double-layer gold gratings structure[J]. 2021, (9): 6-9+13. DOI: 10.13873/J.1000-9787(2021)09-0006-04.
In order to reduce the influence of grating period on surface plasmon resonance(SPR)
simplify the fabrication process of high sensitivity SPR sensor and make SPR easier to be excited
a fiber sensor model of double-layer gold gratings is proposed according to the mechanism of SPR excited by periodic structure.Because of the momentum compensation between the double-layer gratings
SPR is more easily excited.And the near-field coupling between the gratings increases the resonance intensity.It is assembled easily and its feasibility is verified by the finite element method.The sensing characteristics of the D-shaped fiber sensor are studied and the influence of structural parameters on resonance is found.It provides a reference for the processing of D-shaped fiber sensor based on SPR.