Enhanced optical activity and circular dichroism in twisted photonic crystal fiber

We demonstrate experimentally and theoretically that the core-guided mode in helically twisted photonic crystal fiber exhibits resonantly enhanced optical activity and circular dichroism in the vicinity of anti-crossings with leaky orbital angular momentum (OAM) modes in the cladding. This arises be...

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Bibliographic Details
Published in:Optics letters 2015-10, Vol.40 (20), p.4639-4642
Main Authors: Wong, G K L, Xi, X M, Frosz, M H, Russell, P St J
Format: Article
Language:English
Subjects:
Angular momentum
Circularity
Cladding
Crystal fibers
Dichroism
Optical activity
Photonic crystals
Wavelengths
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Summary:We demonstrate experimentally and theoretically that the core-guided mode in helically twisted photonic crystal fiber exhibits resonantly enhanced optical activity and circular dichroism in the vicinity of anti-crossings with leaky orbital angular momentum (OAM) modes in the cladding. This arises because the anti-crossings for left and right circularly polarized core modes occur at slightly different wavelengths.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.40.004639