Advanced Fabrication Technologies for Micro/Nano Optics and Photonics (Veranstaltung : 2020 : San Francisco, Calif.) Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XIII Bellingham, Washington, USA : SPIE, 2020 (2020), Artikel-Nummer 112920A, ca. 2 Seiten 1 Online-Ressource
von Juemin Yi ; Vladimir Smirnov ; Dongchao Hou ; Heiko Kollmann ; Zsuzsanna Pápa ; Péter Dombi ; Sven Stephan ; Daniel Espeloer ; Christoph Lienau ; Martin Silies
Deutsche Physikalische Gesellschaft Verhandlungen der Deutschen Physikalischen Gesellschaft Bad Honnef : DPG, 1997 (2017), Dresden, HL 39.9, insges. 1 S.
Deutsche Physikalische Gesellschaft Verhandlungen der Deutschen Physikalischen Gesellschaft Bad Honnef : DPG, 1997 (2017), Dresden, HL 39.5, 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
