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    Controllable coherent perfect absorption

    16.12.14 - Nanophotonics and Metrology We exploit the versatility provided by metal–dielectric composites to demonstrate controllable coherent perfect absorption (CPA) or anti-lasing in a slab of heterogeneous medium. The slab is illuminated by coherent light from both sides, at the same angle of incidence and the conditions required for CPA are investigated as a function of the different system parameters. Our calculations clearly elucidate the role of absorption as a necessary prerequisite for CPA. We further demonstrate the controllability of the CPA frequency to the extent of having the same at two distinct frequencies even in presence of dispersion, rendering the realization of anti-lasers more flexible.

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    Making the invisible visible!

    16.12.14 - Nanophotonics and Metrology We investigate the mediation of symmetry-forbidden atomic transitions using plasmonic nanostructures. We show that the excitation of the electric dipole-forbidden, quadrupole-allowed 62S1/2−52D5/2 transition in cesium may be enhanced by more than 6 orders of magnitude in the intense, inhomogeneous near field of a plasmonic nanoantenna. Using optical reciprocity, the enhancement can be understood to apply to spontaneous emission as well, allowing the fast and efficient optical detection of excited atoms.

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    Anisotropic Purcell factor

    16.12.14 - Nanophotonics and Metrology The mechanism of using the anisotropic Purcell factor to control the spontaneous emission linewidths in a four-level atom is theoretically demonstrated; if the polarization angle bisector of the two dipole moments lies along the axis of large/small Purcell factor, destructive/constructive interference narrows/widens the fluorescence center spectral lines. Large anisotropy of the Purcell factor, confined in the subwavelength optical mode volume, leads to rapid spectral line narrowing of atom approaching a metallic nanowire, nanoscale line width pulsing following periodically varying decay rates near a periodic metallic nanostructure, and dramatic modification on the spontaneous emission spectrum near a custom-designed resonant plasmon nanostructure. The combined system opens a good perspective for applications in ultracompact active quantum devices.

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    Double resonant plasmonic antenna

    16.12.14 - Nanophotonics and Metrology We present a novel plasmonic antenna geometry – the double resonant antenna (DRA) – that is optimized for second-harmonic generation (SHG). This antenna is based on two gaps coupled to each other so that a resonance at the fundamental and at the doubled frequency is obtained. Furthermore, the proximity of the localized hot spots allows for a coupling and spatial overlap between the two field enhancements at both frequencies. Using such a structure, both the generation of the second-harmonic and its re-emission into the far-field are significantly increased when compared with a standard plasmonic dipole antenna. Such DRA are fabricated in aluminium using electron beam lithography and their linear and nonlinear responses are studied experimentally and theoretically.

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    Professorship at the Stockholm University for a former PhD student

    16.12.14 - CDM | Management of Technology Dr. Olov Isaksson has been hired by Stockholm Business School, Stockholm University, Sweden as assistant professor in Operations Management.

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    Eurostars and Eureka: next calls launched by SERI

    16.12.14 - Research Office CZ - CH (R&D EUREKA Project Outlines). Deadline 31 December, 2014 UK - CH (R&D Eurostars Projects). Deadline March 5, 2015 BE - CH (R&D EUREKA Project Outlines). Deadline 15 January, 2015

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    Best thesis award

    16.12.14 - Earthquake Engineering and Structural Dynamics Laboratory Congratulations to Sarah Petry

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    Optimizing the use of water for drip irrigation

    15.12.14 - Cooperation Wireless sensor technology, adapted to local climatic conditions, alerts small producers in the semi-arid regions of Burkina Faso to the best time to irrigate, according to the plants’ needs, resulting in higher yields and water saving.

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    SNSF Starting Grant awarded to Prof. Katerina Argyraki

    15.12.14 - ERC Grants Katerina Argyraki, Professor at the Laboratory Network Architecture, has been awarded a STARTING GRANT by the SNSF in the context of the so-called “Temporary Backup Schemes” for the European Research Council (ERC) grants. This transitional measure of the SNSF offers the awardee an adequate substitute for ERC grants.

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    SNSF Starting Grant awarded to Prof. Sophia Haussener

    15.12.14 - ERC Grants Sophia Haussener, Professor at the Laboratory of Renewable Energy Science and Engineering, has been awarded a STARTING GRANT by the SNSF in the context of the so-called “Temporary Backup Schemes” for the European Research Council (ERC) grants. This transitional measure of the SNSF offers the awardee an adequate substitute for ERC grants.

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