Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization

O 50.9: Poster

Tuesday, March 17, 2020, 18:15–20:00, P2/EG

Manipulating single 3D plasmonic nanostructures with a focused helium ion beam — •Annika Bräuer, Christoph Dreser, Dieter P. Kern, and Monika Fleischer — Institute for Applied Physics and Center LISA+, Tübingen, Germany

Although particle plasmonics is a well-studied topic and quite well understood when it comes to confining light to the nanometer scale or tuning resonances, there still is ample scope in engineering nanostructures for higher near-field enhancements (NFE) [1] on the one hand and a better positioning and accessibility of hot spots on the other hand. In view of far-field properties, defining the directionality of the antenna emission is of strong interest.

Improvements in tuning such properties are mostly limited by fabrication processes. A helium ion microscope is a powerful tool for manipulating structures on a sub-5 nm-scale, offering a broad spectrum of features for NFE. By processing conical nanoantennas with a focused helium ion beam [2,3], we show that the resonant behavior can be changed as well as the emission characteristics, and near-field enhancement can be induced at defined positions.

[1] A. García-Etxarri et al., Optics Express 20, 25201-25212 (2012)

[2] M. Fleischer et al., Nanotechnology 21, 65301 (2010)

[3] F. Laible et al., Nanotechnology 30, 235302 (2019)