Composition law for polarizers

Details Composition law for polarizers Composition law for polarizers

2008-08-09

arxiv.org/abs/0808.1355v1

Phys. Rev. A 78, 033810 (2008)

Physics

Optics

23 pages, 9 figures, accepted for publication in Physical Review A

Scientific paper

10.1103/PhysRevA.78.033810

The polarization process when polarizers act on an optical field is studied. We give examples for two kinds of polarizers. The first kind presents an anisotropic absorption - as in a polaroid film - and the second one is based on total reflection at the interface with a birefringent medium. Using the Stokes vector representation, we determine explicitly the trajectories of the wave light polarization during the polarization process. We find that such trajectories are not always geodesics of the Poincar\'e sphere as it is usually thought. Using the analogy between light polarization and special relativity, we find that the action of successive polarizers on the light wave polarization is equivalent to the action of a single resulting polarizer followed by a rotation achieved for example by a device with optical activity. We find a composition law for polarizers similar to the composition law for noncollinear velocities in special relativity. We define an angle equivalent to the relativistic Wigner angle which can be used to quantify the quality of two composed polarizers.

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