Abstract

We investigate the behavior of a linearly polarized pulse interacting with a multilevel rotary chiral medium. Due to the strong chirality induced by electromagnetic fields together with the Fizeau effect, the two spatially refracted [left-circularly polarized (LCP) and right-circularly polarized (RCP)] beams of the incident pulse show typical dual rotation. First of all, we present a modified form of Snell’s law, which describes the unusual refraction of two beams in a chiral medium. Then we study the properties of the refraction beams and find that the angle between the two beams, the divergence angle, rotates in the spinning direction of the rotary medium. In addition, the chirality and rotation of the medium are controlled by external sources, so we can manipulate the exact position of the divergence angle. This property of the system can be used to measure the degree of birefringence of a chiral medium. The difference in refractive indices of the LCP and RCP beams has an equivalent effect on the orbital angular momenta of the beams; thus, the probe field can be modulated efficiently and may find applications in spintronics. Moreover, the scheme can be useful for metamaterial applications, accurate position control of the transmitted images, and pulse. A possible experimental realization of the model is also discussed.

© 2018 Optical Society of America

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