Publications by authors named "Florian Spreyer"

While plasmonic particles can provide optical resonances in a wide spectral range from the lower visible up to the near-infrared, often, symmetry effects are utilized to obtain particular optical responses. By breaking certain spatial symmetries, chiral structures arise and provide robust chiroptical responses to these plasmonic resonances. Here, we observe strong chiroptical responses in the linear and nonlinear optical regime for chiral L-handed helicoid-III nanoparticles and quantify them by means of an asymmetric factor, the so-called g-factor.

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Article Synopsis
  • The study explores second harmonic generation (SHG) in monolayer transition metal dichalcogenides (TMD), particularly WS, and how it is influenced by the polarization of excitation light.
  • By integrating plasmonic nanostructures with 1L-WS, they created a hybrid metasurface that alters the polarization dependency of SHG, which is impacted by both the lattice structure of the plasmonic array and the orientation of the 1L-WS.
  • The results reveal that this hybrid metasurface achieves significant enhancements in SHG signals—over 40 times greater in certain polarization states—while also demonstrating attenuation in typically allowed states, highlighting the role of symmetries in these systems.
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