Feasibility investigation of exposed-core fiber for methadone sensing in biological fluids

In this paper, we explore numerically the feasibility of a methadone sensor based on novel exposed-core optical fiber coated with a sensitive polymeric layer. The sensor characteristics have been simulated using the Finite Element Method (FEM). In particular, we have shown that the sensor performance can be enhanced, more specifically the minimum detectable concentration of methadone can be reduced, via a suitable choice of the fiber cross section.