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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Gain Induced Optical Transparency in Meta-Subunits Giuseppe Strangi, Antonio De Luca and Roberto Bartolino LICRYL (Liquid Crystals Laboratory, IPCF-CNR) Center of Excellence CEMIF.CAL and Department of Physics, University of Calabria 87036 Rende (CS), Italy – Giuseppe.Strangi@fis.unical.it This work is aimed to compensate absorptive losses in optical metamaterials based on gain functionalized core shell gold nanoparticles. In particular, resonant energy transfer from organic fluorescent molecules to noble metal nanoparticles properly designed to create reconfigurable optical metamaterials via self-assembling routes is reported. Multiple experimental investigations show that losses at optical frequencies, mainly due to plasmon-radiation field coupling, can be partly compensated. Resonant excitation energy transfer occurs via non-radiative process, by proper overlapping gain and plasmonic spectra and by optimizing size-ratios. The gain assistance of plasmonic elements through non-radiative processes is emphasized by Fluorescence quenching, enhanced Scattering Rayleigh, mitigation of radiation damping and related radiative and non-radiative effects. References: [1] M.I. Stockman , Nature Photonics, 2, 327, (2008) [2] Fang, Th. Koschny, M. Wegener, and C. M. Soukoulis, Phys. Rev. B 79, 241104 (2009). [3] G. Strangi, A. De Luca, S. Ravaine and R. Bartolino, submitted to Phys. Rev. Lett. 18
Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Numerical and Experimental Studies on Guided Resonances in Photonic Quasicrystals Armando Ricciardi (1) , Ilaria Gallina (2) , Marco Pisco (2) , Stefania Campopiano (1) , Giuseppe Castaldi (2) , Andrea Cusano (2) , and Vincenzo Galdi (2) (1) University of Naples “Parthenope”, Department for Technologies Naples, Italy – E-mail: armando.ricciardi@uniparthenope.it, stefania.campopiano@uniparthenope.it (2) University of Sannio, Department of Engineering Benevento, Italy – E-mail: ilaria.gallina@unisannio.it, pisco@unisannio.it, castaldi@unisannio.it, acusano@unisannio.it, vgaldi@unisannio.it Guided resonances (GRs) [1] in photonic crystal (PC) slabs have been the subject of several recent studies. Such resonances can be observed in the transmittance/reflectance response of a plane-wave-excited PC slab as narrow Fano-like resonant line shapes superimposed on a smoothly varying background, and stem from the interference between the directly transmitted/reflected wave and the waves originating from the excited leaky modes. Here, we compactly review the salient results from a series of ongoing investigations [2-5] on GRs in aperiodically-ordered “photonic quasicrystal” (PQC) slabs, intrinsically tied to the concept of “quasicrystal” in solid-state physics [6]. In particular, we show numerically [2] and experimentally [5] that, in spite of the seemingly necessary spatial periodicity, GRs could also be observed in PC slabs with quasiperiodic supercells based on the Ammann- Beenker (octagonal) tiling. Besides the phenomenological implications, our results endow with new perspectives and degrees of freedom in the defectengineering of GRs [3], and pave the way for new developments and applications (e.g., to sensing [4]). References [1] S. H. Fan and J. D. Joannopoulos, “Analysis of guided resonances in photonic crystal slabs,” Phys. Rev. B, 65, 235112, 2002 [2] A. Ricciardi, I. Gallina, S. Campopiano, G. Castaldi, M. Pisco, V. Galdi, and A. Cusano, “Guided resonances in photonic quasicrystals,” Opt. Express, 17, 6335-6346, 2009. [3] I. Gallina, M. Pisco, A. Ricciardi, S. Campopiano, G. Castaldi, A. Cusano, and V. Galdi, “Guided resonances in photonic crystals with point-defected aperiodically-ordered supercells,”Opt. Express, 17, 19586-19598, 2009. [4] M. Pisco, A. Ricciardi, I. Gallina, G. Castaldi, S. Campopiano, A. Cutolo, A. Cusano, and V. Galdi, “Tuning efficiency and sensitivity of guided resonances in photonic crystals and quasi-crystals: a comparative study,” Opt. Express, 18, 17280-17293, 2010 [5] A. Ricciardi, M. Pisco, I. Gallina, S. Campopiano, V. Galdi, L. O’ Faolain, T. F. Krauss, and A. Cusano, “Experimental evidence of guided resonances in photonic crystals with aperiodically-ordered supercells,” to be published in Opt. Lett., 2010 [6] M. Senechal, Quasicrystals and Geometry, Cambridge University Press, Cambridge, UK, 1995. 19
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Page 3 and 4: Meta 2010 - Committees Chairmen Met
Page 7 and 8: Meta 2010 Foreword Ladies and Gentl
Page 9 and 10: FEM 2010 Foreword Ladies and Gentle
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Meta 2010 & FEM 2010 - Rome, 13-15
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Abstracts - Dipartimento di Elettronica Applicata

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