Author Affiliations

S. Franke-Arnold,¹ J. Leach,¹ M. J. Padgett,¹ V. E. Lembessis,² D. Ellinas,³ A. J. Wright,⁴ J. M. Girkin,⁴ P. Öhberg,⁵ and A. S. Arnold⁶

¹Dept. of Physics and Astronomy, SUPA, University of Glasgow, Glasgow G12 8QQ, UK

²New York College, 38 Amalias Str., GR 105 58, Athens, Greece

³Dept. of Sciences, Div. of Mathematics, Technical University of Crete, GR 731 00Chania, Crete, Greece

⁴Inst. of Photonics, SUPA, University of Strathclyde, Glasgow G4 0NW, UK

⁵Dept. of Physics, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK

⁶Dept. of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, UK