Deutsche Physikalische Gesellschaft Verhandlungen der Deutschen Physikalischen Gesellschaft Bad Honnef : DPG, 1997 (2017), Dresden, O 59.31, insges. 1 S.
Deutsche Physikalische Gesellschaft Verhandlungen der Deutschen Physikalischen Gesellschaft Bad Honnef : DPG, 1997 (2017), Dresden, O 59.22, insges. 1 S.
We report long-lived, highly spatially localized plasmon states on the surface of nanoporous gold nanoparticles-nanosponges-with high excitation efficiency. It is well known that disorder on the nanometer scale, particularly in two-dimensional systems, can lead to plasmon localization and large field enhancements, which can, in turn, be used to enhance nonlinear optical effects and to study and exploit quantum optical processes. Here, we introduce promising, three-dimensional model systems for light capture and plasmon localization as gold nanosponges that are formed by the dewetting of gold/ silver bilayers and dealloying. We study light-induced electron emission from single nanosponges, a nonlinear process with exponents of n approximate to 5...7, using ultrashort laser pulse excitation to achieve femtosecond time resolution. The long-lived electron emission process proves, in combination with optical extinction measurements and finite-difference time-domain calculations, the existence of localized modes with lifetimes of more than 20 fs. These electrons couple efficiently to the dipole antenna mode of each individual nanosponge, which in turn couples to the far-field. Thus, individual gold nanosponges are cheap and robust disordered nanoantennas with strong local resonances, and an ensemble of nanosponges constitutes a meta material with a strong polarization independent, nonlinear response over a wide frequency range.
Light London : Nature Publishing Group, 2012 Bd. 6 (2017), (20. Okt.), e17075, insges. 8 S. Online-Ressource
Deutsche Physikalische Gesellschaft Verhandlungen der Deutschen Physikalischen Gesellschaft Bad Honnef : DPG, 1997 (2017), Dresden, O 33.1, insges. 1 S.
CLEO$2016 (San Jose, Calif.) CLEO: QELS_Fundamental Science Washington, D.C., USA : OSA, The Optical Society, 2016 (2016), Artikel Nr. FTh4B.3, insges. 2 S. Online-Ressource
International Conference on Ultrafast Phenomena (2016 : Santa Fe, New Mexico) International Conference on Ultrafast Phenomena 2016, Santa Fe, New Mexico United States, 17-22 July 2016 Washington, D.C., USA : OSA - The Optical Society, 2016 (2016), Paper UTu5A.3, Seite 3-4 1 Online-Ressource
International Conference on Ultrafast Phenomena (2016 : Santa Fe, New Mexico) International Conference on Ultrafast Phenomena 2016, Santa Fe, New Mexico United States, 17-22 July 2016 Washington, D.C., USA : OSA - The Optical Society, 2016 (2016), Paper UW1A.6, Seite 6-8 1 Online-Ressource