Ultra-broadband and highly sensitive surface plasmon resonance sensor based on four-core photonic crystal fibers
Jianfei Liao, Ziping Ding, Yingmao Xie, Xinghua Wang, Zekai Zeng, Tianye Huang
Abstract
An ultra-broadband surface plasmon resonance (SPR) sensor with high sensitivity adopting four-core photonic crystal fiber is designed. The impacts of fiber structure parameters on the sensing performance are theoretically studied in detail. The investigation results demonstrate that, the average wavelength sensitivity of our proposed sensor is up to 1.135 × 104 nm/refractive index unit (RIU) within the ultra-broad wavelength range of 1.548–2.683 μm when the refractive index (RI) of analyte varies in a large range of 1.423–1.523. Furthermore, the maximum amplitude sensitivity of 550 RIU−1 is achieved if RI changes from 1.423 to 1.433. Therefore, the proposed sensor can work both in the telecommunication window, and the mid-infrared wavelength regime.