  Bioinspiration has widely been demonstrated to be a powerful approach for the
design of innovative structures and devices. Recently, this concept has been
extended to the field of elasticity, dynamics, and metamaterials. In this
paper, we propose a seashell-inspired metasensor that can simultaneously
perform spatial frequency mapping and act as a polarizer. The structure emerges
from a universal parametric design that encompasses diverse spiral geometries
with varying circular cross sections and curvature radii, all leading to
tonotopic behavior. Adoption of an optimization process leads to a planar
geometry that enables us to simultaneously achieve tonotopy for orthogonally
polarized modes, leading to the possibility to control polarization as well as
the spatial distribution of frequency maxima along the spiral axis. We
demonstrate the versatility of the device and discuss the possible applications
in the field of acoustics and sensing.
