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Viewing upcoming talks containing the keyword: 19
Physics and Astronomy Colloquia
Speaker: Prof Christelle Monat (Ã‰cole Centrale de Lyon , Lyon Institute of Nanotechnology )
The exponential growth in the amounts of data exchanged through the Internet already poses some challenges regarding the energy consumption, size, cost and speed of the associated optoelectronic equipment to route and transfer the information across the network. This calls for the development of new technologies that are intrinsically fast and more energy efficient. A possible solution is to route and manage these high speed data directly in the optical domain, within devices that are meant to be compact and integrated onto a single platform, for instance by exploiting the optical nonlinear properties of the underlying material. In this context, integrated nonlinear optics is advantageous, provided that the material platform yields a high nonlinear response and is CMOS compatible to leverage the huge investment of the microelectronics industry. While SOI has now become extremely mature for passively transferring light information on a chip at Telecom wavelengths with very low loss, its nonlinear response is compromised by a high nonlinear absorption at telecom wavelengths, which limits certain applications (parametric amplification for instance) and tends to restrict the device operation speed (via the generation of free carriers, for instance). I will present here the use of alternative material platforms such as hydrogenated amorphous silicon, in collaboration with CEA-Leti, which provides a better nonlinear performance than crystalline silicon, while maintaining the compatibility with CMOS fabrication technologies. We will discuss the potentialities offered by combining this material with structures providing a tight confinement of light (like photonic crystals) and dispersion engineering techniques to move beyond silicon photonics and perform all-optical signal processing on-chip at Telecom wavelengths.
Beside telecommunication applications, the mid-IR range (between 2 and 5um) represents a spectral window of huge interest for biophotonic and sensing applications, due to the strong signature of biochemical compounds in this range. The associated technology is yet extremely power hungry and very expensive. Here again, the development of integrated optics and the migration of some concepts developed in the near-IR to the mid-IR are required to lead to the widespread use of this technology. One key challenge is the realization of integrated broadband light sources on chip covering a wide spectral window within a single device. We will discuss here the potential of the SiGe alloys, which provide a CMOS compatible platform, with linear and nonlinear properties that have been so far unexplored in the mid-IR
On: February 12, 2016 From: 10h00 To: 11h00View talk
History of Mathematics
Speaker: Professor June Barrow-Green (Open University)
Olaus Henrici (1840–1918) studied in Germany before making his career in London,establishing a Laboratory of Mechanics at the newly formed Central Technical College. Hewas a proponent of pure (projective) geometry and a leading figure in the British moveagainst the teaching of Euclid, promoting the use of models in teaching and research. Hismodels included surfaces of the second and third orders, as well as Sylvester's ninth orderamphigenous surface. He exhibited many of his models in front of the London MathematicalSociety and was a significant contributor to the great exhibitions in South Kensington in 1876and in Munich in 1893. June will discuss Henrici’s rather extensive role in the promotion ofprojective geometry in Britain and describe the origin and development of some of hissurface models, avoiding technical details but with lots of pictures.
On: February 18, 2016 From: 16h00 To: 17h30View talk
Physics and Astronomy Colloquia
Speaker: Dr Natalia Korolkova (University of St Andrews)
In this talk I describe the nature of non-classical correlation beyond entanglement. Quantum discord is introduced as a measure of such quantum correlations and compared to some other measures. The role of system-environment coupling in dynamics of these correlations and some operational interpretations of discord are discussed, in particular activation of correlations into entanglement. The quantum nature of correlations is illustrated with an example of bright light beams. In this context, some illuminating quantum information protocols based on quantum properties of optical modes are briefly described.
On: February 19, 2016 From: 10h00 To: 11h00View talk
Speaker: Professor Gang Liu (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)
Solar-driven water splitting or reduction of CO2 on photocatalysts represents one promising technique to convert solar energy into chemical energy. One current central task is to develop efficient solar-driven photocatalysts. The efficiency of photocatalysis is co-determined by three basic processes including light absorption, charge separation and catalytic conversion. Concerning these three basic processes, we focus on three strategies, 1) band engineering, 2) heterostructuring and 3) facet controlling, to tailor the properties of photocatalysts. The context of this talk mainly includes three parts, 1) the crucial role of spatial distribution of dopants or defects in realizing the redshift of the whole light absorption edge for a wide visible light absorption, 2) three kinds of core-shell engineered heterostructures with the ability of realizing spatial separation of photogenerated charge carriers, and 3) tailoring the exposure of different facets of photocatalysts.
On: February 23, 2016 From: 15h30 To: 16h30View talk
Embedding Boron and Nitrogen Atoms within Aromatic Molecules: From Reactive Intermediates to Nanographenes
Speaker: Holger Bettinger (Tubingen)
Substitution of CC units by BN is an attractive means of changing electronic properties of molecules. A case in point is the relationship between benzene and its inorganic analogue borazine, sometimes termed “inorganic benzene.” One of our research projects in Tübingen focuses on the experimental realization of reactive intermediates that are boron-nitrogen analogues of conventional organic reactive intermediates. In the presentation our recent results on 1,2-azaborines, the BN derivatives of benzynes, and how that research led to the borazine derivative of hexa-peri-hexabenzocoronene (HBC), an iconic nanographene molecule, will be discussed.
On: February 24, 2016 From: 15h30 To: 16h30View talk
Physics and Astronomy Colloquia
Speaker: Prof Andrew Daley (University of Strathclyde, Quantum Optics and Quantum Many-body Systems)
Over the course of the last two decades, experiments with ultracold atoms and molecules have developed to a level where we have strongly interacting quantum gases that are controllable and measurable on a single-particle level. This now allows us to engineer a range of fundamental models from solid state physics in experiments, and explore their properties cleanly on a microscopic level.
Beyond textbook demonstrations of equilibrium and single-particle properties (including insulating phases, magnetic superexchange, and Bloch oscillations), this now enables us to explore fundamental aspects of non-equilibrium dynamics in quantum many-particle systems. These range from from the approach of systems to equilibrium, and thermalisation in statistical mechanics, to the influence of the environment and decoherence in open many-body quantum systems.
I will give an overview of recent developments in these areas, and touch on the recent measurement of many-body entanglement with ultracold atoms in optical lattices.
On: February 26, 2016 From: 10h00 To: 11h00View talk