Negative refraction and omnidirectional total transmission at a planar interface associated with a uniaxial medium

The conditions for yielding negative refraction as well as omnidirectional total transmission at planar interfaces between uniaxial media have been analyzed. It is found that both phenomena can occur at a wide variety of interfaces associated with uniaxial media. In particular, when certain conditions are satisfied, even an interface between isotropic and uniaxial media can also exhibit negative refraction and omnidirectional total transmission, adding considerably to the flexibility in potential device applications.