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Title: Evidence of guided resonances in photonic quasicrystal slabs
Authors: Ricciardi, Armando
Pisco, Marco
Cutolo, Antonello
Cusano, Andrea
O'Faolain, Liam
Krauss, Thomas F.
Castaldi, Giuseppe
Galdi, Vincenzo
Keywords: Transmission
Sensitivity
Scattering
Order
Band
QC Physics
Issue Date: 29-Aug-2011
Citation: Ricciardi , A , Pisco , M , Cutolo , A , Cusano , A , O'Faolain , L , Krauss , T F , Castaldi , G & Galdi , V 2011 , ' Evidence of guided resonances in photonic quasicrystal slabs ' Physical Review B , vol 84 , no. 8 , 085135 .
Abstract: We report on the experimental evidence of Fano-type guided resonances (GRs) in aperiodically-ordered photonic quasicrystal slabs. With specific reference to the Ammann-Beenker (8-fold symmetric, quasiperiodic) octagonal tiling geometry, we present our experimental results on silicon-on-insulator devices operating at near-infrared wavelengths, and compare them with the full-wave numerical predictions based on periodic approximants. Our results indicate that spatial periodicity is not strictly required for the GR excitation, and may be effectively surrogated by weaker forms of long-range aperiodic order which intrinsically provide extra degrees of freedom (e. g., higher-order rotational symmetries, richer defect states and phase-matching conditions, etc.) to be exploited in the design and performance optimization of nanostructured dielectric slabs operating in the out-of-plane configuration. The essential spectral features may be qualitatively understood in terms of phase-matching conditions derived from approximate homogenized models, and turn out to be effectively captured by full-wave modeling based on suitably-sized periodic approximants.
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2872
DOI: http://dx.doi.org/10.1103/PhysRevB.84.085135
ISSN: 1098-0121
Type: Journal article
Rights: ©2011 American Physical Society
Appears in Collections:University of St Andrews Research
Physics & Astronomy Research



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