HE_1,1 mode excited surface plasmon resonance for high-sensitivity sensing by photonic crystal fibers

Surface plasmon resonance (SPR) is widely used in photonic crystal fiber sensors. In this work, a photonic crystal fiber sensor based on <i>H</i><i>E</i>_1,1 mode excited SPR is designed and analyzed by the finite element method. The maximum wavelength sensitivity, optimal resolution, and amplitude sensitivity of the optical fiber sensor are 24,600 nm/RIU, 4.07×10^-6<i>R</i><i>I</i><i>U</i>, and 1164.13<i>R</i><i>I</i><i>U</i>^-1, respectively, for the refractive index range between 1.29 and 1.39. The sensor has excellent properties and wide application prospects in bimolecular and biochemical sensing, environmental monitoring, food safety, and other fields.