Optical activity in twisted solid-core photonic crystal fibers

Xi, X.M., Weiss, T., Wong, G.K.L., Biancalana, F., Barnett, S.M. , Padgett, M.J. and St. J. Russell, P. (2013) Optical activity in twisted solid-core photonic crystal fibers. Physical Review Letters, 110(14), Art. 143903. (doi:10.1103/PhysRevLett.110.143903)

80388ii.pdf - Accepted Version



In this Letter we show that, in spectral regions where there are no orbital cladding resonances to cause transmission loss, the core mode of a continuously twisted photonic crystal fiber (PCF) exhibits optical activity, and that the magnitude of the associated circular birefringence increases linearly with twist rate and is highly reproducible. In contrast to previous work on twist-induced circular birefringence, PCF has zero linear birefringence and an on-axis core, making the appearance of circular birefringence rather unexpected. A theoretical model based on symmetry properties and perturbation theory is developed and used to show that both spin and orbital angular momentum play a role in this effect. It turns out that the degenerate left- and right-circularly polarized modes of the untwisted PCF are not 100% circularly polarized but carry a small amount of orbital angular momentum caused by the interaction between the core mode and the hollow channels.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Barnett, Professor Stephen
Authors: Xi, X.M., Weiss, T., Wong, G.K.L., Biancalana, F., Barnett, S.M., Padgett, M.J., and St. J. Russell, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2013 American Physical Society
First Published:First published in Physical Review Letters 110(14):143903
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
517171Holographic ghost microscopyMiles PadgettRoyal Society (ROYSOC)WRMA09R2HLLP&A - PHYSICS & ASTRONOMY
549871Challenges in Orbital Angular MomentumMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I012451/1P&A - PHYSICS & ASTRONOMY