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O: Fachverband Oberflächenphysik

O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas

O 65.7: Vortrag

Mittwoch, 18. März 2020, 12:00–12:15, WIL A317

Comparative study of plasmonic antennas fabricated by electron and ion beam lithography — •Vlastimil Křápek, Michal Horák, Lukáš Kejík, Kristýna Bukvišová, Vojtěch Švarc, and Tomáš Šikola — CEITEC, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic

We present a comparative study of plasmonic antennas (gold nanodiscs) fabricated by electron beam lithography and focused ion beam milling. Plasmonic antennas were characterized using transmission electron microscopy including electron energy loss spectroscopy and energy dispersive X-ray spectroscopy, and atomic force microscopy. We have found stronger plasmonic response with better field confinement in the antennas fabricated by electron beam lithography, which is attributed to their better structural quality, homogeneous thickness, and only moderate contamination mostly of organic nature [1].

Further, we compare monocrystalline and polycrystalline plasmonic antennas (gold nanorods) fabricated by focused ion beam lithography. Interestingly, monocrystalline nanorods feature inclined facets due to anisotropic rate of focused ion beam milling, while the facets of the polycrystalline nanorods are upright. Electron energy loss spectroscopy revealed that the parameters of the localized surface plasmon modes (energies, Q factors, and peak loss probabilities) in both structures are within the experimental error identical. We conclude that the polycrystallinity does not deteriorate the optical properties of plasmonic antennas.

[1]. M Horák et al., Sci. Rep. 8, 9640 (2018).