Guided resonances in photonic crystals with point-defected aperiodically-ordered supercells

TL;DR

This paper explores how introducing point defects in aperiodically-ordered photonic crystal supercells can excite guided resonances and control their symmetry properties, offering a new approach to resonance engineering.

Contribution

It demonstrates that symmetry-breaking point-defects in aperiodic supercells enable excitation and control of guided resonances, providing an alternative to shape asymmetrization methods.

Findings

Breaking supercell mirror symmetries enables uncoupled GR excitation.

Point-defects allow control over the symmetry of field distributions.

Aperiodic supercells offer diverse defect sites for resonance engineering.

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.