Hi, Can someone explain the concept of "Poincare sphere"? What's the relationship between the Poincare Sphere and the Degree of polarization of EM fields? Thanks Madara
The Poicare sphere is a way of describing the 4-component Stokes vector: http://en.wikipedia.org/wiki/Polarization (about 1/2-way down) The state of polarization is represented by a point on the sphere. Note: for fully polarized light, S_0 = 1 and the point lies on the surface of the sphere; partially polarized light has S_0<1 and so the point lies within the sphere. Going from the Stokes formulation to the Jones formulation can be a little tricky: http://en.wikipedia.org/wiki/Stokes_vector Since the Stokes/Mueller forumlation is inherently statistical in nature, while the Jones matrices only hold for completely polarized light. Does that help?