The Index Perturbation grid attribute consists of 'np density' and 'temperature' grid attributes, accounting for the refractive index changes due to the electron-hole density as well as the temperature. These grid attribute data can be recorded on a finite-element mesh in a CHARGE, HEAT, DGTD and FEEM simulation.
The Permittivity Rotation grid attribute allows users to add an arbitrary Euler rotation to the dielectric tensor. The main parameters are the "angle convention" and the Euler angles theta/phi/psi.
The LC Orientation grid attribute allows users to specify arbitrary orientations for the Liquid Crystal director. The main parameters are the angles theta/pi (specifying the LC orientation), and the dielectric tensor will be set accordingly.
The Matrix Transform grid attribute allows users to add an arbitrary unitary matrix to the dielectric tensor. The main parameter is the unitary matrix U.