SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Focus: Self-Assembly of Plasmonic Nanostructures (joint session CPP/HL)
HL 52.4: Vortrag
Freitag, 31. März 2023, 10:30–10:45, GÖR 226
Uniform and sensitive Raman signal by self-assembled plasmonic nanoparticle gratings — •Sezer Seçkin1 and Tobias A. F. König1,2 — 1Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden — 2Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden
Despite recent advancements in this field, it is still challenging to manufacture SERS substrates that provide high sensitivity and uniformity over large areas. One can overcome this challenge by employing a colloidal approach such as directed self-assembly of plasmonic nanoparticles into ordered structures [König et al. Advanced Functional Materials 31.36 (2021): 2105054]. Here, we have produced highly ordered 1D plasmonic lattice structures by assembling nanoparticles of various sizes. With the help of the low optical loss of colloidal gratings, we studied the enhancement capabilities of the SERS substrates by the excitation of a fluorescent reporter Rhodamine 6G, at different wavelengths. We conducted the polarization-dependent SERS enhancement by exciting colloidal gratings parallel and perpendicular to the polarization of the excitation lasers. Moreover, we studied the effect of the surface plasmon modes on the SERS enhancement at different orientations using the FDTD simulation. The mapping technique visually interpreted the SERS performances of other substrates, which supports the reproducibility and uniformity of the Raman signals over larger areas. Controlling the particle size while keeping the periodicity constant allows us to tune the SERS enhancement factor, which can be helpful for various sensing applications.