Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.2: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

Optimizing Yagi-Uda antennas for high directivity and electrical driving in the visible regime — •Philipp Grimm, René Kullock, and Bert Hecht — NanoOptics & Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Antennas are fundamental devices which couple localized fields to far-field radiation and vice versa. In radio technology, a widespread antenna geometry is found in Yagi-Uda antennas whose far-field emission is highly directional, thus enabling efficient communication between two instances.

In the optical regime metallic nanoparticles exhibiting plasmonic resonances can act as antennas for light. So far they have already been arranged to Yagi-Uda antennas and showed pronounced directivity [1,2]. However, while these attempts were based on optical pumping our aim is to electrically drive them similar to [3]. In order to obtain reasonable working antennas for this more complex case, here we use an analytic dipole interaction model and numerical boundary element simulations to characterize possible geometries and extract design rules. Using that we find fabricable Yagi-Uda antenna geometries which show high directivity and are still suitable for electrical driving.

[1] A. Curto et al., Science 329, 5994 (2010)

[2] T. Kosako et al., Nat. Photonics 4, 5 (2010)

[3] J. Kern et al., Nat. Photonics 9, 9 (2015)