Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.40: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Fabrication of bow-tie like infrared antennas with small gaps by nanosphere lithography — Hendrik Janssen, •Jón Mattis Hoffmann, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany

Infrared absorption spectroscopy allows for the investigation of characteristic molecule absorption bands of sample materials by directly probing molecular vibrations. The sensitivity of infrared spectroscopy has been increased by several orders of magnitude with optical antennas.[1-3] Decreasing the distance between two antennas leads to antenna coupling and increased field-enhancement [4], resulting in even higher enhancement factors over non-coupling antennas.

In this work we present metallic bow-tie like structures with gap sizes down to sub 20 nm. To prepare these structures we use the easy method of nanosphere lithography (NSL) and two steps of evaporation on a tilted sample. For spectral characterization of the infrared resonances we use polarization resolved far-field measurements.

[1] R. Adato et al.; PNAS, 106, 19227 (2009)

[2] F. Neubrech et al.; PRL 101, 157403 (2008)

[3] R. Bukasov et al.; Analyt. Chem. 81, 4531 (2009)

[4] P. J. Schuck, et al, Phys. Rev. Lett. 94, 017402 (2005)