Controlling and positioning hybrid nanoparticle-DNA origami plasmonic antennas
Markus Etzkorn, Laboratory of emerging nanometrology, TU-Braunschweig, Germany
Institute of Applied Physics, TU-Braunschweig, Germany
DNA origami has proven to be a very versatile nano-breadboard that allows to create essentially unlimited amounts of almost identical copies of very different types of nanostructures either by itself, or by attaching secondary particles to it. In many cases the created structures can also be positioned on pre-structured surfaces with very high accuracy. Here I want to report about our efforts to create nano-plasmonic antennas from Au-particles that are attached to rather simple DNA origamis. We have investigated different means to determine and control the distance between the particles on each origami. We have also investigated how the hybrid structures can be positioned on different substrates on pattern with one- or zero-dimensional confinement using drop-casting on pre-structured surfaces. In our case the pre-structured pattern was created by electron beam lithography. This offers very high positional control with few nanometer precision for a large number of plasmonic structures. With this approach also the orientation of the plasmonic structures can be controlled. We also investigate the important parameters that determine the occupation of possible adsorption sites within the incubation time after drop casting.
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