Graphene‐assisted synthesis NH3 gas sensor based on silicon photonics crystal fiber and surface plasmon resonance

In this article, we theoretically simulated a silicon core-based photonics crystal fiber combined with the Au/graphene coating thin-film to surround the fiber-air-holes with a plasmonic active medium for sensing NH 3 gas concentrations. By means of our previous research experiences and the related theory, the complex refractive index of graphene under different concentrations of NH 3 exposing was analyzed and calculated by using the finite element method. The sensing average sensitivity of 0.0269 nm/ppm for the proposed NH 3 -gas sensor was theoretically predicted for the concentration of NH 3 in the range from 1 ppm to 1000 ppm. In addition, the proposed photonics crystal fiber sensor can be extended into the other field applications, such as medical diagnostics, bio-chemical detection etc.