Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Plasmonics and Nanooptics
O 59.1: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG1
Fabrication of nanoaperture arrays in a free standing gold film for electron energy-loss spectroscopy — •Mike Prämassing1, Stephan Irsen2, and Stefan Linden1 — 1Physikalisches Institut Universität Bonn, Nußallee 12, D53115 — 2Forschungszentrum Caesar Bonn, Ludwig-Erhard-Allee 2, D53175
Periodic nanoaperture arrays in thin metallic films are well known to exhibit extraordinary optical transmission orders of magnitude higher than predicted by standard aperture theory [1]. In contrast, for thinner metal films a suppressed optical transmission has been reported [2]. Both effects can be explained by resonant coupling of the incident light to surface plasmon polaritons (SPPs) via the array. Scanning transmission electron microscopy (STEM) in combination with electron energy-loss spectroscopy (EELS) is a powerful tool for the spatial and spectral characterization of the SPPs. However, STEM-compatibility restricts us to fabricate the films either free-standing or on a membrane, transparent for the electron beam. We present two STEM-compatible fabrication approaches for nanoaperture arrays in metallic films with thicknesses from 10 nm to 100 nm: Focused ion beam milling in a free-standing film or electron beam lithography on an electron transparent SiN membrane. The chosen range of film thickness corresponds to the transition region between enhanced and suppressed optical transmission.
[1] Ebbesen et al., Nature 391, 667-669 (1998).
[2] Braun et al., Phys. Rev. Lett. 103, 203901 (2009).