In addition to the detection and assignment of vibrational modes, the polarization dependence of SERS is important to reveal details about the spatial orientation of molecules bound to the nanoparticles . Polarized Raman is a technique that involves measuring polarization parallel and perpendicular to the excitation light using filters to obtain information about molecular shape and orientation in crystals, polymers, and liquid crystals . Various polarization schemes can be used for anisotropic samples, and the polarization of both the incident and scattered light is usually controlled in polarized Raman experiments .