Optical activity in twisted solid-core photonic crystal fibers

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Xi, X. M. and Weiss, T. and Wong, G. K. L. and Biancalana, F. and Barnett, S. M. and Padgett, M. J. and Russell, P. St. J. (2013) Optical activity in twisted solid-core photonic crystal fibers. Physical Review Letters, 110 (14). 143903. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.110.143903)

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Abstract

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:Article
    ID code:44076
    Dates:
    Date
    Event
    4 April 2013
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:17 Jun 2013 13:54
    Last modified:24 Nov 2024 01:08
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/44076
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