Guided resonances in photonic crystals with point-defected aperiodically-ordered supercells.
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.
Gallina
Ilaria
I
Waves Group, Dept of Engineering, University of Sannio, Corso Garibaldi 107, I-82100 Benevento, Italy.
Pisco
Marco
M
Ricciardi
Armando
A
Campopiano
Stefania
S
Castaldi
Giuseppe
G
Cusano
Andrea
A
Galdi
Vincenzo
V
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D008027:Light; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation