Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Plasmonics and Nanooptics VII: Applications and Other Aspects
HL 61.2: Talk
Wednesday, March 22, 2017, 15:15–15:30, TRE Ma
Directional Emission from Active Dielectric Nanoantennas — •Manuel Peter1, André Hildebrandt2, Christian Schlickriede3, Thomas Zentgraf3, Jens Förstner2, and Stefan Linden1 — 1Physikalisches Institut, University of Bonn, Nußallee 12, D-53115 Bonn, Germany — 2Department of Electrical Engineering, University of Paderborn, Warburger Strasse 100, D-33098 Paderborn, German — 3Department of Physics, University of Paderborn, Warburger Strasse 100, D-33098 Paderborn, Germany
Here, we report on the directional light emission from an active dielectric nano antenna. The leaky-wave antennas are made from Hafnium dioxide. Colloidal semiconductor quantum dots with an emission wavelength of 780 nm are deposited with a lithographic technique from an aqueous solution into the feed gap of the antenna. Quantum dots serve as dipole sources. Their fluorescence is guided by the director that acts as a leaky waveguide which emits the light in a narrow angle distribution into the substrate. A reflector is used to increase the efficiency of the antenna. By imaging the back-focal plane of a high NA microscope objective, we can directly map the angular distribution of the fluorescence. In our experiment we observe a strong effect of the antennas with a main lobe of the fluorescence pointing into the substrate with a longitudinal angle of θ=21°. Additionally we will present results on the polarization of the directed light and the change of directivity for antennas with different dimensions. All the measured angular intensity distributions are in good agreement with the numerical calculations.