M. Prämassing
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Near-Field Observation of the Photonic Spin Hall Effect Open
The photonic spin Hall effect, referring to the spatial separation of photons with opposite spins due to spin-orbit interactions, has enabled potential for various spin-sensitive applications and devices. Here, using scattering-type near-f…
Electron energy loss spectroscopy on freestanding perforated gold films Open
We report on a combined far- and near-field study of surface plasmon\npolaritons on freestanding perforated gold films. The samples are fabricated by\nfocused ion beam milling of {a periodic hole array into} a carbon membrane\nfollowed by …
Experimental Near-Field Characterization of Plasmonic Nanostructures Open
The spatial resolution of conventional optical technologies is fundamentally limited by diffraction due to the wave nature of light. A promising platform to overcome this diffraction limit in nanophotonic applications is the field of plasm…
Interferometric near-field characterization of plasmonic slot waveguides in single- and poly-crystalline gold films Open
Single-crystalline gold films show superior plasmonic properties compared to their poly-crystalline counterparts. However, this advantage comes at the cost of a more complex preparation process. It is thus crucial to validate whether the i…
Freestanding metasurfaces for optical frequencies Open
We present freestanding metasurfaces operating at optical frequencies with a total thickness of only 40 nm. The metasurfaces are fabricated by focused ion beam milling of nanovoids in a carbon film followed by thermal evaporation of gold a…