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DS: Fachverband Dünne Schichten

DS 38: Plasmonics and Nanophotonics O-V (jointly with HL and O)

DS 38.3: Vortrag

Mittwoch, 16. März 2011, 15:30–15:45, WIL A317

Spiral Optical Nanoantenna — •Daniel Dregely, Martin Schäferling, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, D-70569 Stuttgart, Germany

Advances in nanofabrication in the past years allowed for adaption of concepts of the radiofrequency and microwave regime to optical wavelengths [1]. Recently, the road has been opened towards more complex antenna geometries suitable for tailoring light emission on the nanoscale [2,3]. Self-complementary structures are commonly used in the high frequency regime to transmit and receive signals over a broad frequency range.

We investigate a self-complementary spiral nanoantenna for the optical wavelength range. The structure has different handedness for opposite incident directions of light. Albeit being planar, its emission cone is normal to the surface. We study experimentally the optical properties in transmission and reflection for circularly polarized light. Numerical simulations confirm our measurements and give insight to the near-field response of our structure.

References:

[1]P. Mühlschlegel et al., Science 308, 1607 (2005)

[2]T. Kosako, Y. Kadoya, and H. F. Hofmann, Nature Photonics 4, 312-315 (2010)

[3]A. G. Curto et al., Science 329, 930-933 (2010)