  Glide symmetry offers new degrees of freedom to engineer the properties of
periodic structures, and thus it has been exploited in various electromagnetic
structures. However, so far there has been little exploration on the impact
that glide symmetry can offer in the field of acoustics. In this paper, we
explore glide-symmetric acoustic waveguides, highlighting their dispersion
characteristics and guiding properties and demonstrating opportunities in the
context of acoustic devices. Here we analytically derive their dispersive
features applying a semi-analytical mode matching technique. We then
demonstrate how the unusual dispersion properties of glide-symmetric acoustic
waveguides can be used to achieve very sharp frequency responses. Based on
these results, we propose a sensing platform for liquid analytes that exhibits
large sensitivity and linearity. Furthermore, by introducing fluid motion, we
leverage these responses to design an acoustic isolator based on acoustic
Mach-Zehnder interferometry, whose design is more favorable in terms of
footprint and complexity in comparison to other acoustic nonreciprocal devices
that do not rely on glide symmetry.
