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O: Fachverband Oberflächenphysik

O 63: Plasmonics and nanooptics: Applications and other aspects I

O 63.3: Vortrag

Mittwoch, 14. März 2018, 12:30–12:45, MA 041

Directional emission from dielectric antennas: A parameter study — •Till Leuteritz and Stefan Linden — Physikalisches Institut, Universität Bonn, D-53115

Metal nanostructures can be used as optical antennas to shape the far field emission pattern of quantum dots to achieve directional emission with large front-to-back ratios. In order to get a broadband emission and to have low losses, dielectric materials are a great candidate for these structures. Following this approach, M. Peter et al demonstrated recently a dielectric leaky-wave antenna made from Hafniumdioxide (HfO2) with a front-to-back ratio of around 12.5 dB [1].

In this presentation, we report on a systematic study of the dependence of the emission properties of dielectric leaky wave antenna on the geometrical parameters. The antennas consist of only two simple dielectric building blocks, a director and a reflector, whose length, height and width is parametrically changed. Quantum dots placed in between reflector and director serve as internal light source.

We find that by varying the width, the director changes from a leaky waveguide to a transversal single mode guided waveguide to a transversal multimode guided waveguide. Moreover, we observe that short leaky waveguides exhibit a bright emission peak at small angles that shifts to larger angles with increasing length. A similar behavior is also found for the transversal single mode guided waveguides.

[1] Directional Emission from Dielectric Leaky-Wave Nanoantennas; Manuel Peter et al.; Nano Letters 2017 17 (7), 4178-4183; DOI: 10.1021/acs.nanolett.7b00966