Polarized Polariton Fields on the Poincaré Sphere
The state of polarization of light can be represented on the so-called Poincaré sphere, which provides a graphic representation of the Stokes parameters . The circular-right polarization R corresponds to the north pole of the sphere and the circular-left polarization L to the south pole. The other cardinal points define the diagonal D, antidiagonal A, horizontal H, and vertical V polarizations. The Poincaré sphere can be used to track the state of polarization in a variety of contexts, such as spatial variations .[more]
This Demonstration addresses the case of temporal variation. It shows the evolution in time of the polarization of light emitted by superimposing polariton fields, that is, from the light-matter interaction (Rabi coupling) in a semiconductor microcavity. It was recently proposed theoretically, and demonstrated experimentally , that such systems can afford a largely tunable spanning of the Poincaré sphere, depending on the parameters of two pulses exciting the system to create the state
This Demonstration lets you tune these parameters as well as the system parameters (Rabi frequency , polariton lifetime ) and track the state of polarization in time. Without decay (), the polarization describes a green circle, whereas with decay (), the polarization drifts around the sphere to converge to an asymptotic value, pointed to by the red arrow; the blue line shows the polarization trajectory between these two points, which can be tracked in time with the purple arrow.[less]
Various trajectories of the polarization on the Poincaré sphere:
Snapshot 1: spanning of the hemisphere from linear to right-circular polarization
Snapshot 2: close to full span of the Poincaré sphere, approaching so-called full Poincaré beams
Snapshot 3: nontrivial fast-varying polarization trajectory in strongly dissipative systems
 D. Colas, L. Dominici, S. Donati, A. A. Pervishko, T. C. H. Liew, I. A. Shelykh, D. Ballarini, M. de Giorgi, A. Bramati, G. Gigli, E. del Valle, F. P. Laussy, A. V. Kavokin, and D. Sanvitto, "Spanning the Full Poincaré Sphere with Polariton Rabi Oscillations." arxiv.org/abs/1412.4758.
 L. Dominici, D. Colas, S. Donati, J. P. Restrepo Cuartas, M. De Giorgi, D. Ballarini, G. Guirales, J. C. López Carreño, A. Bramati, G. Gigli, E. del Valle, F. P. Laussy, and D. Sanvitto, "Ultrafast Control and Rabi Oscillations of Polaritons," Physical Review Letters, 113, 2014 p. 226401. journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.226401.