title: Guided resonances in photonic crystals with point-defected aperiodically-ordered supercells.
abstract: In this paper, we study the excitation of guided resonances (GRs) in photonic-crystal slabs based on point-defected aperiodically-ordered supercells. With specific reference to perforated-slab structures and the Ammann-Beenker octagonal lattice geometry, we carry out full-wave numerical studies of the plane-wave responses and of the underlying modal structures, which illustrate the representative effects induced by the introduction of symmetry-preserving and symmetry-breaking defects. Our results demonstrate that breaking the supercell mirror symmetries via the judicious introduction of point-defects enables for the excitation of otherwise uncoupled GRs, with control on the symmetry properties of their field distributions, thereby constituting an attractive alternative to those GR-engineering approaches based on the asymmetrization of the hole shape. In this framework, aperiodically-ordered supercells seem to be inherently suited, in view of the variety of inequivalent defect sites that they can offer.
authors.affiliation: Waves Group, Dept of Engineering, University of Sannio, Corso Garibaldi 107, I-82100 Benevento, Italy.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Gallina
authors.forename: Marco
authors.initials: M
authors.lastname: Pisco
authors.forename: Armando
authors.initials: A
authors.lastname: Ricciardi
authors.forename: Stefania
authors.initials: S
authors.lastname: Campopiano
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Castaldi
authors.forename: Andrea
authors.initials: A
authors.lastname: Cusano
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Galdi
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D008027:Light; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation