Electromagnetically Induced Transparency in an Ideal Plasma.

A process analogous to electromagnetically induced transparency in atoms is described for an ideal plasma. Two electromagnetic fields whose frequency difference is near, but not equal, to the plasma frequency will drive a longitudinal plasma oscillation whose contribution to the current density opposes the current density produced by either field, if alone. This creates a passband at frequencies which would otherwise be below cutoff. [S0031-9007(96)02013-3]