  Light scalar fields coupled to matter are a common consequence of theories of
dark energy and attempts to solve the cosmological constant problem. The
chameleon screening mechanism is commonly invoked in order to suppress the
fifth forces mediated by these scalars, suficiently to avoid current
experimental constraints, without fine tuning. The force is suppressed
dynamically by allowing the mass of the scalar to vary with the local density.
Recently it has been shown that near future cold atoms experiments using
atom-interferometry have the ability to access a large proportion of the
chameleon parameter space. In this work we demonstrate how experiments
utilising asymmetric parallel plates can push deeper into the remaining
parameter space available to the chameleon.
