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AbstractMultimode interferometers are coming of age both as sensors and components of quantum circuits.Here we investigate an interferometer based on a porous thinfilm sensor of refractive index of fluids. Eigenmode analysis is used to identify effective single- and multi-mode sensing regimes and the corresponding realizations of interferometer. A general measure in a form of Fisher information is introduced to describe the impact of the film porosity on sensitivity and nonlinearity of thedoi:10.2478/optof-2014-0006 fatcat:brzjc3fbzjd2rnxhfm327d6sde