Ultrafast dynamics of surface plasmon polaritons in plasmonic metamaterials |
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Authors: | C Ropers G Stibenz G Steinmeyer R Müller DJ Park KG Lee JE Kihm J Kim QH Park DS Kim C Lienau |
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Institution: | (1) Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489 Berlin, Germany;(2) School of Physics, Seoul National University, Seoul, 151-742, Korea;(3) Korea Research Institute of Standards and Science, Yusung, Taejon, 305-600, Korea;(4) Department of Physics, Korea University, Seoul, 136-701, Korea |
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Abstract: | Using near-field scanning optical microscopy and ultrafast laser spectroscopy, we study the linear optical properties of subwavelength
nanoslit and nanohole arrays in metal films, which are prototype structures for novel plasmonic metamaterials. Near-field
microscopy provides direct evidence for surface plasmon polariton (SPP) excitation and allows for spatial imaging of the corresponding
SPP modes. By employing spectral interferometry with ultrashort 11-fs light pulses, we directly reconstruct the temporal structure
of the electric field of these pulses as they are transmitted through the metallic nanostructures. The analysis of these data
allows for a quantitative extraction of the plasmonic band structure and the radiative damping of the corresponding SPP modes.
Clear evidence for plasmonic band gap formation is given. Our results reveal that the coherent coupling between different
SPP modes can result in a pronounced suppression of radiative SPP damping, increasing the SPP lifetime from 30 fs to more
than 200 fs. These findings are relevant for optimizing and manipulating the optical properties of novel nano-plasmonic devices.
PACS 42.70.Qs; 07.79.Fc; 42.25.-p |
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