Optical properties polarization parameter?

Greetings.

My name is Alejandro Trejo and I am performing some calculations of the electronic and optical properties of semiconductor nanowires using materials studio 4.3 in the castep module. My question is the following, I don´t comprehend how the polarization parameter works, it is the polarization of the electric field of the light using the lattice coordinates? or how do i must interpret this parameter. It is important because i am investigating the optical response when the light is polarized parallel and perpendicular to the wire axis but i dont know how if my interpretation is the correct.

Thank you in advance for any reply

Eng. Alejandro Trejo Baños

Instituto Politecnico Nacional (Mexico)

Escuela Superior de Ingenieria Mecanica y Electrica

Campus Culhuacan