Modelling a simple arc shaped gold coated PCF-based SPR sensor.

In this paper, we investigate a simple arc shaped Au coated photonic crystal fiber-based refractive index sensor that works on principle of surface plasmon resonance. We analyze the performance of the proposed sensor using the finite element method. Further, we analyze the effect of the arc shaped metal coating on different orientations of air holes in the cladding region. For the sensing range of 1.32–1.37, the proposed PCF sensor structure exhibits a maximum wavelength sensitivity of 14,100 nm/RIU with the resolution of 7.09 × 10^–6 RIU. Also, this sensor exhibits a maximum amplitude sensitivity of 109 RIU⁻¹ with a resolution of 9.17 × 10^–6 RIU. Further, from the linearity of the proposed sensor, R², is 0.96181 for the refractive index ranging between 1.32 and 1.37. Furthermore, we carry out perturbation analysis to ensure that the proposed sensor withstands the fabrication tolerance. Therefore, the proposed sensor holds good for a potential contender for sensing in chemical and biological applications. [ABSTRACT FROM AUTHOR]