Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Photonik 1

Q 23.9: Vortrag

Dienstag, 13. März 2012, 12:30–12:45, V38.01

Interference, Couping and Switching of Higher Order Modes in Asymmetric Dimers — •Martina Abb1, Yudong Wang2, Kees C. H. de Groot2, Javier Aizpurua3, and Otto Lambert Muskens11SEPnet and the Department of Physics and Astronomy, University of Southampton, United Kingdom — 2School of Electronics and Computer Science, University of Southampton, United Kingdom — 3DIPC and CSIC-UPV/EHU, Donostia-San Sebastian, Spain

Plasmonic nanoantennas are receiving enormous interest for their capacity of controlling light on the nanoscale [1]. Like many other nanostructures, they sustain both radiative (bright) and nonradiative (dark) modes. Here, we present a comprehensive study of coupling and interference of higher order modes, both radiative and nonradiative in asymmetric dimers for the first time.

Based on a full electromagnetic calculation including retardation, we explore the coupling behaviour of dark and bright modes in coupled nanorods depending on gap size and mode position. We also show experimental proof of the interaction between the first three modes in lithographically designed asymmetric nanoantenna dimers. Furthermore, we present the corresponding nonlinear response of our coupled asymmetric nanorod system when placed on a photoexcitable semiconductor (see [2] for earlier work).

[1] P. Mühlschlegel, H.-J. Eisler, O. J. F. B. Martin, B. Hecht and D. W. Pohl, Science 308, 1607 (2005).

[2] M. Abb, P. Albella, J. Aizpurua and O. L. Muskens, Nano Lett. 11, 2457 (2011).

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