Identification of Bloch-modes in hollow-core photonic crystal fiber cladding Couny, F. ; Benabid, F. ; Roberts, P. J. ; Burnett, M. T. ; Maier, S. A. Abstract Publication: Optics Express Pub Date: January 2007 DOI: 10.1364/OE.15.000325 Bibcode: 2007OExpr..15..325C