  We present a design for an acoustic metamaterial that mimics the behaviour of
the active cochlea. This material is composed of a size-graded array of
cylindrical subwavelength resonators, has similar dimensions to the cochlea and
is able to reproduce the frequency separation of audible frequencies.
Non-linear amplification is introduced to the model in order to replicate the
behaviour of the cochlear amplifier. This formulation takes the form of a
fluid-coupled array of Hopf resonators. We seek solutions based on a modal
decomposition, so as to retain the physically-derived coupling between
resonators.
