Near-field mapping of infrared nanoantennas
Martin Schnell, Aitzol Garcia-Etxarri, Andreas Huber, Kenneth B Crozier, Javier Aizpurua, Rainer Hillenbrand
PROCEEDINGS OF THE FOURTH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION | IEEE | Published : 2010
We demonstrate amplitude- and phase-resolved near-field mapping of nanoantennas by scattering-type near-field optical microscopy. The technique is applied to monitor the evolution of the near-field oscillations of infrared gap antennas progressively loaded with metallic bridges of varying size. Our results provide direct experimental evidence that nanoscale infrared near fields can be controlled by antenna loading, which is in excellent agreement with numerical calculations.
Awarded by European FP7 project "Nanoantenna"
We thank Nanosensors (Erlangen) for providing HF-etched Si tips and C. F. Quate and G. S. Kino (both Stanford University) for previous insights on the optical antennas studied in this article. We thank M. Raschke (Seattle) for stimulating discussions. Supported by the Etortek program of the Department of Industry of the Basque Government and the European FP7 project Nanoantenna (Health-F5-2009-241818). J.A. acknowledges the hospitality of LCAM during the elaboration of this work.