  The Casimir force between two parallel plates separated by anisotropic media
is investigated. We theoretically calculate the Casimir force between two
parallel plates when the interspace between the plates is filled with
anisotropic media. Our result shows that the anisotropy of the material between
the plates can significantly affect the Casimir force, especially the direction
of the force. If ignoring the anisotropy of the in-between material makes the
force to be repulsive (attractive), by contrast, taking the anisotropy into
account may produce an extra attractive (repulsive) force. The physical
explanation for this phenomenon is also discussed.
