Dual Parametric Sensing Based on Anti‐Resonant Fiber

ABSTRACT

A dual parametric sensing structure of anti‐resonant fiber (ARF) based on surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) is presented in this paper. Gold film and gold nanoparticles are deposited inside two large anti‐resonant tubes of the cladding to excite the SPR and LSPR effects. Numerical simulations based on the finite element method (FEM) are performed to evaluate the sensing performance. The results show that there are two resonance loss peaks, peaks 1 and 2, caused by SPR and LSPR effects, respectively. When the refractive index (RI) of analyte 1 changes, both peaks 1 and 2 shift, with sensitivities of 7250 nm/RIU and 10000 nm/RIU, and the linearities are 0.978 and 0.995. When the RI of analyte 2 changes, only peak 1 shifts, with a sensitivity of 4625 nm/RIU, and the linearity is 0.991, while peak 2 remains constant. The cross‐sensitivity problem can be resolved by the dual wavelength matrix method. This dual parametric sensing structure has potential applications and development prospects in various fields such as environmental monitoring and biomedical detection.