MEASUREMENT METHOD OF ELECTRIC BIREFRINGENCE SPECTRUM IN FREQUENCY DOMAIN

摘要

Birefringence externally induced by orientation or deformation of molecules has been used frequently for investigation of the microscopic molecular-level properties closely related to molecular conformation and polarization. When the electric field is adopted out of a wide variety of external fields, the observed phenomenon is called electric birefringence or Kerr effect [1]. Because of molecular symmetry, electric birefringence is intrinsically a function of the square of the electric field, that is, a second-order nonlinear effect. In addition, a time-dependent electric field yields electric birefringence relaxation, which gives us information on the dynamic behavior of molecules such as molecular rotation, molecular deformation and internal motion of carriers. Thus the electric birefringence relaxation is a powerful method to investigate microscopic properties of electro-active molecules and have been applied to various systems [1].