  Motivated by the problem of Casimir energy, we investigate the idea of using
inhomogeneity of surfaces instead of their corrugation, which leads to Casimir
interaction between two inhomogeneous semi-transparent concentric cylinders.
Using the multiple scattering method, we study the Casimir energy and torque
between the cylinders with different potentials subjected to Dirichlet boundary
conditions, both in weak and strong coupling regimes. We also extend our
formalism to the case of two inhomogeneous dielectrics in a weak coupling
regime.
