D-Shaped Tellurite Photonic Crystal Fiber Hydrogen and Methane Sensor Based on Four-Wave Mixing With SPR Effect

Abstract A new D-shaped tellurite photonic crystal fiber sensor based on the four-wave mixing (FWM) effect with surface plasmon resonance (SPR) is designed and optimized. The substrate of (D-PCF) glass, polished plated gold film hydrogen gas-sensitive film. An air hole inner cladding, which methane film, selected as second sensing channel to simultaneously measure concentration methane. Based mixing, wavelength shifts Stokes anti-Stokes spectra resulting from variation gas can be used accurately detect concentrations hydrogen. Meanwhile, it found that SPR increase shifts, means sensitivity augment. After parameter optimization, maximum sensitivities are 4.03 nm/% ?14.19 nm/%, respectively. Both linearities up 99.9%. resolution 1.25×10 ?2 % 7.14×10 ?3 %. Moreover, length this only 20 mm, conducive construction a compact or ultra-compact embedded FWM sensor.