Berlin 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 5: Plasmonics: Nanoantennas, Nanoparticles

O 5.8: Vortrag

Montag, 16. März 2015, 12:15–12:30, MA 042

A novel dielectric unidirectional antenna — •Andre Hildebrandt, Matthias Reichelt, Torsten Meier, and Jens Förstner — University of Paderborn, Germany

Optical and infrared antennas provide a promising way to couple photons in and out of nanoscale structures. As counterpart to conventional radio antennas, they are able to increase optical fields in sub-wavelength volumes [1], to enhance excitation and emission of quantum emitters or to direct light, radiated by quantum emitters [2]. The directed emission of these antennas has been mainly pursued by surface plasmon based devices, e.g. Yagi-Uda like antennas, which are rather complicated due to the coupling of several metallic particles. Also, like all metallic structures in optical or infrared regime, these devices are very sensitive to fabrication tolerances and are affected by strong losses.

In this paper we present a design idea and numerical simulations for a dielectric antenna, which performs better than plasmonic counterpart, due to the lack of losses by an appropriate choice of the dielectric material. These antennas are robust concerning fabrication tolerances and can be realized with different materials for both the antenna and the substrate, without using high index materials.

[1] A. Hildebrandt et al., "Optimization of the intensity enhancement in plasmonic nanoantennas," AIP Conference Proceedings 1475, pp. 59-61 (2012)

[2] A. G. Curto et al., "Unidirectional Emission of a Quantum Dot Coupled to a Nanoantenna," Science 329, 930 (2010)