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HL: Fachverband Halbleiterphysik

HL 61: Plasmonics and Nanooptics VII: Applications and Other Aspects

HL 61.2: Vortrag

Mittwoch, 22. März 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.