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Optical Activity in Twisted Solid-Core Photonic Crystal Fibers

MPG-Autoren
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Xi,  X. M.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Weiss,  T.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Wong,  G. K. L.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Biancalana,  F.
Biancalana Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  P. St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Zitation

Xi, X. M., Weiss, T., Wong, G. K. L., Biancalana, F., Barnett, S. M., Padgett, M. J., et al. (2013). Optical Activity in Twisted Solid-Core Photonic Crystal Fibers. PHYSICAL REVIEW LETTERS, 110(14): 143903. doi:10.1103/PhysRevLett.110.143903.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002D-678F-B
Zusammenfassung
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. DOI:10.1103/PhysRevLett.110.143903