Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Photonics and Nanooptics II: Nonlinear Response
O 52.11: Vortrag
Mittwoch, 9. März 2016, 13:00–13:15, S051
Suppression of radiative damping and enhancement of second harmonic generation in bull’s eye nanoresonators — •Vladimir Smirnov1, Jue-min Yi1, Xianji Piao2, Jiho Hong2, Heiko Kollmann1, Martin Silies1, Wei Wang1, Petra Groß1, Ralf Vogelgesang1, Namkyoo Park2, and Christoph Lienau1 — 1University of Oldenburg, Germany — 2Seoul National University, Korea
Bull’s eye (BE) nanoresonators, consisting of a central aperture in an Au film surrounded by a series of concentric circular grooves, are highly interesting structures in the context of manipulating light propagation [1] and also optimizing the coupling to quantum emitters [2]. Using broadband linear spectral interferometry and ultrahigh time resolution spectroscopy, we study the temporal response and the local field enhancement of such BE nanoresonators. We find surprisingly long lifetimes of the extended resonator eigenmodes of more than 35 fs [3]. Furthermore, by replacing the central circular hole with an annular ring void, we obtain 50-times higher second harmonic generation efficiency, illustrating the efficient field enhancement and confinement possible in BE nanoresonators. The combination of spatial light concentration with high quality factors has high potential for sensing and coherent control of light-matter interactions on the nanoscale.
[1] H. J. Lezec et al., Science 297, p. 820 (2002); [2] A. G. Curto et al., Science 329, p. 930 (2010); [3] J. Yi et al, submitted to ACS Nano (2015)