Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: [O] Plasmonics and Nanooptics III (Joint Session DS/O/HL)

DS 27.1: Talk

Wednesday, March 24, 2010, 10:30–10:45, H32

3D optical Yagi-Uda nanoantenna array — •Daniel Dregely, Richard Taubert, and Harald Giessen — University of Stuttgart, Germany

Optical nanoantennas have gained a lot of interest in the past few years [1,2]. They are able to link propagating radiation and confined optical fields. Only little work has been done on complex antenna geometries on the nanoscale. In our experiments, we investigate a 3D optical Yagi-Uda nanoantenna array. Due to the high directivity of the array structure the incoming light is received efficiently at resonant wavelengths in the near-infrared (around λ = 1.3 μm).

Our 3D gold nanoantenna structure was fabricated with electron beam lithography using layer-by-layer stacking. We measured the transmission and reflection spectra of the nanoantenna array from both directions in order to examine the directive behavior of the structure. FIT-calculations agree very well with our experimental findings and confirm the concentration of the incoming plane-wave radiation to the feeding points of the antenna array.

References: [1] P. Mühlschlegel, H.-J. Eisler, O. J. F. Martin, B. Hecht, and D. W. Pohl, Science 308, 1607 (2005). [2] T. H. Taminiau, F. D. Stefani, F. B. Segerink, and N. F. van Hulst, Nature Photon. 2, 234 (2008).