Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Plasmonics and nanooptics: Fabrication and characterization
O 4.3: Vortrag
Montag, 12. März 2018, 11:00–11:15, MA 041
Fabrication and Near-Field Characterization of Plasmonic Slot Waveguides — •Matthias Liebtrau1, Mike Prämassing1, Stephan Irsen2, and Stefan Linden1 — 1Physikalisches Institut, Universität Bonn, D-53115 — 2Research Center caesar, D-53175
Simulations indicate that plasmonic slot waveguides (PSWs) — based on a sub-wavelength dielectric gap engraved in a thin metal film — permit lateral light confinement siginificantly below the diffraction limit while sustaining mode propagation over several microns [1]. Therefore, PSWs are considered to facilitate highly integrated optical nano-circuits, able to defeat decisive limitations of present electronic and photonic devices [2]. By means of focused ion beam (FIB) milling we manage to fabricate PSWs with slot widths down to 30 nm in a 50 nm gold film, thermally evaporated on silica. We present amplitude- and phase-resolved near-field measurements utilizing a scattering-type scanning near-field optical microscope (s-SNOM) in transmission configuration. Combination with a tunable near-infrared laser source allows for spectroscopic analyses. Following [3] we have deduced the effective index and propagation length of the supported plasmon mode as a function of the slot width at telecom wavelengths. Furthermore, we present our recent studies on slot mode propagation through fundamental integrated circuit elements such as 90∘-bends and T-splitters, as well as coupling between neighbouring PSWs.
[1] G. Veronis et al., Opt. Lett. 30, 3359–3361 (2005)
[2] J. A. Schuller et al., Nat. Mater. 9, 193–204 (2010)
[3] A. Andryieuski et al., Nano Lett. 14, 3925–3929 (2014)