CST – Computer Simulation Technology

Guided resonances in photonic quasicrystals

Title:
Guided resonances in photonic quasicrystals
Author(s):
Armando Ricciardi, Ilaria Gallina, Stefania Campopiano, Giuseppe Castaldi, Marco Pisco, Vincenzo Galdi ,Andrea Cusano
Source:
Optics EXPRESS
Vol./Issue/Date:
Volume: 17, Issue: 8, April 2009
Year:
2009
Page(s):
6335-6346
Abstract:
In this paper, we report on the first evidence of guided resonances (GRs) in aperiodically-ordered photonic crystals, tied to the concept of “quasicrystals” in solid-state physics. Via a full-wave numerical study of the transmittance response and the modal structure of a photonic quasicrystal (PQC) slab based on a representative aperiodic geometry (Ammann-Beenker octagonal tiling), we demonstrate the possibility of exciting GR modes, and highlight similarities and differences with the periodic case. In particular, we show that, as for the periodic case, GRs arise from the coupling of the incident plane-wave with degenerate modes of the PQC slab that exhibit a matching symmetry in the spatial distribution, and can still be parameterized via a Fano-like model. Besides the phenomenological implications, our results may provide new degrees of freedom in the engineering of GRs, and pave the way for new developments and applications
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