Mechanical Faraday effect for orbital angular momentum-carrying beams

Wisniewski-Barker, E., Gibson, G. , Franke-Arnold, S. , Boyd, R. W. and Padgett, M. J. (2014) Mechanical Faraday effect for orbital angular momentum-carrying beams. Optics Express, 22(10), pp. 11690-11697. (doi: 10.1364/OE.22.011690)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Padgett, Professor Miles and Boyd, Professor Robert and Franke-Arnold, Professor Sonja
Authors: Wisniewski-Barker, E., Gibson, G., Franke-Arnold, S., Boyd, R. W., and Padgett, M. J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
549871Challenges in Orbital Angular MomentumMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I012451/1P&A - PHYSICS & ASTRONOMY