Twist-induced guidance in coreless photonic crystal fiber: A helical channel for light Beravat, R. ; Wong, G. K. L. ; Frosz, M. H. ; Xi, X. M. ; Russell, P. S. J. Abstract Publication: Science Advances Pub Date: November 2016 DOI: 10.1126/sciadv.1601421 Bibcode: 2016SciA....2E1421B