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Deadlines
(Previous Conference: MATERIALS 2016, Corfu Island, Greece, July
14-17, 2016)
PLENARY SPEAKERS:
Prof. Setsuhisa Tanabe, Kyoto University, Kyoto, JAPAN, e-mail: tanabe.setsuhisa.4v@kyoto-u.ac.jp
Title: "Design of Near-Infrared Persistent Phosphors for Bio-Imaging"
Abstract: Persistent phosphor materials at the transparent windows of bio tissues are expected for in vivo imaging without excitation source, which produces various noises such as auto-fluorescence. The ZnGa2O4:Cr3+ spinel phosphor is a successful example of persistent luminescence at 700nm, corresponding to the 1st bio-imaging window. Because of recently advanced availability of InGaAs photo-detectors, near-infrared (NIR) fluorescence probes have been widely developed with luminescence of Nd3+:1.06-mm and Er3+:1.55-mm. We have developed garnet-based persistent phosphors in which Nd3+ or Er3+ ions show very efficient and long NIR persistent luminescence. Photon emission rate and duration of these materials are only slightly lower and shorter than the visible persistent phosphors of Ce3+-doped garnets we developed in 2014, the performance of which is almost comparable to the SrAl2O4: Eu2+, Dy3+. These phosphors can be applied to in vivo imaging in the 2nd and 3rd bio-imaging windows of high transparency and sensitivity of InGaAs detectors.
Prof. Emmanuel Paspalakis, Materials Science Department, School of Natural Sciences, University of Patras, Patras, Greece, e-mail: paspalak@upatras.gr
Title: "Novel Optical Properties of Coupled Quantum - Plasmonic Nanostructures"
Abstract: The strong interaction of light with quantum systems near plasmonic nanostructures leads to significantly modified (mainly enhanced) optical phenomena at the nanoscale. These phenomena have various potential applications in nanophotonics and in quantum technology at the nanoscale. Here, we present recent results from our group in this area. First, we analyze theoretically the response of V-type quantum emitter when interacting with a carbon nanostructure, namely a graphene monolayer or a single-wall carbon nanotube. Quantum interference (QI) effects in spontaneous emission due to the anisotropic Purcell effect arise in both cases. For a graphene monolayer the degree of QI, which can, in general, vary from −1 to, takes values close to 0.333. For the carbon nanotube the confinement of light in one dimension enhances significantly the degree of QI to values well above 0.9. The high degree of QI is obtained for different orientations of the respective transition dipoles and for a wide range of the transition energy, the chemical potential and the nanotube radius. We also present results for the optical response of a four-level double-V-type quantum system which interacts simultaneously with probe and pump laser fields and is located near a two-dimensional array of metal-coated dielectric nanospheres. This system also gives rise to high degree of QI due to anisotropic Purcell effect. By considering different coupling configurations for the pump/probe laser fields, and analyzing the resulting probe absorption spectrum we reveal a variety of phenomena, such as huge enhancement of the absorption at the central line, gain without inversion and phase-dependent absorption spectrum, and their control by varying the distance of the quantum system from the plasmonic nanostructure, the intensity of the pump field(s) and, when applicable, their relative phase. Acknowledgements: E.P. acknowledges the support of "Research Projects for Excellence IKY/Siemens" (Contract No. 23343).