Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
Abstracts - Dipartimento di Elettronica Applicata
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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010<br />
Numerical and Experimental Stu<strong>di</strong>es<br />
on Guided Resonances in Photonic Quasicrystals<br />
Armando Ricciar<strong>di</strong> (1) , Ilaria Gallina (2) , Marco Pisco (2) ,<br />
Stefania Campopiano (1) , Giuseppe Castal<strong>di</strong> (2) , Andrea Cusano (2) ,<br />
and Vincenzo Gal<strong>di</strong> (2)<br />
(1) University of Naples “Parthenope”, Department for Technologies<br />
Naples, Italy – E-mail: armando.ricciar<strong>di</strong>@uniparthenope.it,<br />
stefania.campopiano@uniparthenope.it<br />
(2) University of Sannio, Department of Engineering<br />
Benevento, Italy – E-mail: ilaria.gallina@unisannio.it, pisco@unisannio.it,<br />
castal<strong>di</strong>@unisannio.it, acusano@unisannio.it, vgal<strong>di</strong>@unisannio.it<br />
Guided resonances (GRs) [1] in photonic crystal (PC) slabs have been the<br />
subject of several recent stu<strong>di</strong>es. Such resonances can be observed in the<br />
transmittance/reflectance response of a plane-wave-excited PC slab as narrow<br />
Fano-like resonant line shapes superimposed on a smoothly varying<br />
background, and stem from the interference between the <strong>di</strong>rectly<br />
transmitted/reflected wave and the waves originating from the excited leaky<br />
modes.<br />
Here, we compactly review the salient results from a series of ongoing<br />
investigations [2-5] on GRs in aperio<strong>di</strong>cally-ordered “photonic quasicrystal”<br />
(PQC) slabs, intrinsically tied to the concept of “quasicrystal” in solid-state<br />
physics [6]. In particular, we show numerically [2] and experimentally [5]<br />
that, in spite of the seemingly necessary spatial perio<strong>di</strong>city, GRs could also be<br />
observed in PC slabs with quasiperio<strong>di</strong>c supercells based on the Ammann-<br />
Beenker (octagonal) tiling. Besides the phenomenological implications, our<br />
results endow with new perspectives and degrees of freedom in the defectengineering<br />
of GRs [3], and pave the way for new developments and<br />
applications (e.g., to sensing [4]).<br />
References<br />
[1] S. H. Fan and J. D. Joannopoulos, “Analysis of guided resonances in photonic crystal<br />
slabs,” Phys. Rev. B, 65, 235112, 2002<br />
[2] A. Ricciar<strong>di</strong>, I. Gallina, S. Campopiano, G. Castal<strong>di</strong>, M. Pisco, V. Gal<strong>di</strong>, and A. Cusano,<br />
“Guided resonances in photonic quasicrystals,” Opt. Express, 17, 6335-6346, 2009.<br />
[3] I. Gallina, M. Pisco, A. Ricciar<strong>di</strong>, S. Campopiano, G. Castal<strong>di</strong>, A. Cusano, and V. Gal<strong>di</strong>,<br />
“Guided resonances in photonic crystals with point-defected aperio<strong>di</strong>cally-ordered<br />
supercells,”Opt. Express, 17, 19586-19598, 2009.<br />
[4] M. Pisco, A. Ricciar<strong>di</strong>, I. Gallina, G. Castal<strong>di</strong>, S. Campopiano, A. Cutolo, A. Cusano, and<br />
V. Gal<strong>di</strong>, “Tuning efficiency and sensitivity of guided resonances in photonic crystals and<br />
quasi-crystals: a comparative study,” Opt. Express, 18, 17280-17293, 2010<br />
[5] A. Ricciar<strong>di</strong>, M. Pisco, I. Gallina, S. Campopiano, V. Gal<strong>di</strong>, L. O’ Faolain, T. F. Krauss,<br />
and A. Cusano, “Experimental evidence of guided resonances in photonic crystals with<br />
aperio<strong>di</strong>cally-ordered supercells,” to be published in Opt. Lett., 2010<br />
[6] M. Senechal, Quasicrystals and Geometry, Cambridge University Press, Cambridge, UK,<br />
1995.<br />
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