Abstract
We describe anon-abelian Berry phase in polarization optics, suggested by an analogy due to Nityananda between boosts in special relativity and the effect of elliptic dichroism on polarized light. The analogy permits a simple optical realization of the non-abelian gauge field describing Thomas rotation. We also show how Thomas rotation can be understood geometrically on the Poincaré sphere in terms of the Pancharatnam phase.
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Samuel, J., Sinha, S. Thomas rotation and polarized light: A non-abelian geometric phase in optics. Pramana - J Phys 48, 969–975 (1997). https://doi.org/10.1007/BF02847456
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DOI: https://doi.org/10.1007/BF02847456