BIRREFRINGENCE

8 Outubro 2019, 09:00 • José Manuel Rebordão

The symmetries of the calcite and why dipoles should have different properties as a function of the polarization of the EM wave, in the context of the Lorentz model.

Electrical permittivity tensor as a symmetrical tensor if the Poynting vector retains its use to determine the direction and irradiance of the flow of energy of an EM wave. Symmetric tensors, quadratic forms, real eigenvalues and principal directions Impermeability tensor. Ellipsoid of the Indexes (EI).

How to use the EI to determine the polarization modes and their velocities in an anisotropic medium. Explanation of the value of the EI from Maxwell equations.

Uniaxial materials. Ordinary and extraordinary indexes. Particular cases: waves propagating along or perpendicularly to the optical axis.

Wave plates. Fast and slow axis. Half-wave plates and quarter-wave plates. Rotation of linear polarization and transformation between linear and circular polarization.

Example: How birefringence can be used in CD readers to ensure that the illumination and detection geometries are at 0 degrees.

A brief introduction to the electrooptic effect.

Presentation by Luís Neves: High performance organic photovoltaic cells for indoor use.

 

NEXT CLASS

Electrooptic effect and applications.

BIBLIOGRAPHY

Saleh, Fundamentals of Photonics, Ch. 6.