Microtech2010 2010

Efficient coupling of light into nanometer sized objects via dielectric microcavities and metal nanoantennas

M. Hagner, T. Thomay, M. Kahl, J. Merlein, V. Kohnle, T. Hanke, A. Leitenstorfer, R. Bratschitsch
University of Konstanz, DE

Keywords: optical quantum device


An essential goal in current nanooptics is to enhance the interaction between light and nanometer sized objects. We present two concepts to realize this important interaction. One idea is to place a colloidal semiconductor quantum dot into an optical resonator made of two Bragg mirrors. The fabrication of micropillar resonators out of this planar structures via focussed ion beam milling provides confinement of the cavity modes not only in the direction perpendicular to the Bragg mirrors, but also in the central layer due to total reflections at the sidewalls of the pillar. The other concept is to obtain the efficient coupling of the light field to a nanometer sized object by using plasmonic effects in metals. Therefore we fabricate metal optical nanoantennas by various techniques (electron-beam lithography, focused ion beam milling and colloidal masks). Both concepts can be used for a variety of optical active nanostructures, such as carbon nanotubes, semiconductor quantum dots or organic dye molecules. This route may lead to a new class of robust active optical quantum devices based on single nanoobjects.
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