Abstract
When linearly polarised light is transmitted through a spinning window, the plane of polarisation is rotated. This rotation arises through a phase change that is applied to the circularly polarised states corresponding to the spin angular momentum (SAM). Here we show an analogous effect for the orbital angular momentum (OAM), where a differential phase between the positive and negative modes (±ℓ) is observed as a rotation of the transmitted image. For normal materials, this rotation is on the order of a micro radian, but by using a slow-light medium, we show a rotation of a few degrees. We also note that, within the bounds of our experimental parameters, this rotation angle does not exceed the scale of the spatial features in the beam profile.
Highlights
“Measurement of the rotational frequency shift imparted to a rotating light beam possessing orbital angular momentum,” Phys
The magnetic Faraday effect is a well-known phenomenon that occurs when a light beam passes through a medium subject to a magnetic field, and it has been studied for over a century [1,2,3]
The mechanical Faraday effect, which is related to spin angular momentum (SAM) and rotates the polarisation state of the light, rotates the image and is related to orbital angular momentum (OAM)
Summary
J. Padgett, “On the dragging of light by a rotating medium,” Proc. “Poincare-sphere equivalent for light beams containing orbital angular momentum,” Opt. Lett. J. Padgett, “Rotary photon drag enhanced by a slow-light medium,” Science 333, 65–67 (2011).
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