title: Supermodes of chiral photonic filters with combined twist and layer defects.
abstract: We consider the circularly polarized localized modes of chiral photonic structures with combined central twist and isotropic layer defects. The general filter is shown to suffer from anomalous remittance and saturation of linewidth as the thickness of the structure is increased. However, by choosing parameters that phase match the elements of the round-trip matrix of the isotropic layer defect, we demonstrate the existence of supermodes that maintain exceptional purity of polarization state and exponential decrease in linewidth as the thickness is increased.
authors.affiliation: Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand. ijh@physics.otago.ac.nz
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Hodgkinson
authors.forename: Qi-hong
authors.initials: QH
authors.lastname: Wu
authors.forename: Lakshman
authors.initials: L
authors.lastname: De Silva
authors.forename: Matthew
authors.initials: M
authors.lastname: Arnold
authors.forename: Martin W
authors.initials: MW
authors.lastname: McCall
authors.forename: Akhlesh
authors.initials: A
authors.lastname: Lakhtakia