EM.Cube's [[Planar Module]] provides the following polarization options:
# * TMz# * TEz# * LCPz# * RCPz
The direction of incidence is defined through the theta and phi angles of the propagation vector in the spherical coordinate system. The default values are θ = 180° and φ = 0°, representing a normally incident plane wave propagating along the -Z direction with a +X-polarized electric field vector. In the TM<sub>z</sub> and TE<sub>z</sub> polarization cases, the magnetic and electric fields are parallel to the XY plane, respectively. The left-hand (LCP) and right-hand (RCP) circular polarization cases are restricted to normal incidences only (θ = 180°).