SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Plasmonics and Nanooptics I: Fabrication and Application

O 49.3: Vortrag

Mittwoch, 29. März 2023, 11:00–11:15, WIL A317

Double resonant, monocrystalline plasmonic gratings evolutionary optimized for enhanced SERS sensing — •Thorsten Feichtner¹, Katja Höflich², Enno Schatz¹, Amro Swedan³, Paul Mörk¹, and Muhammad Bashouti^3,4 — ¹Nanooptics & Biophotonics Group, Experimental Physics 5, RCCM, JMU Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Photonic Quantum Technologies, FBH gGmbH Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, D-12489 Berlin, Germany — ³IKI for Nanoscale Science & Technology, BGU of the Negev, Beer-Sheva 8410501, Israel — ⁴Department of Solar Energy and Environmental Physics, SIDEER, J. Blaustein Institutes for Desert Research, BGU of the Negev, Midreshet Ben-Gurion, 8499000, Israel

Surface enhanced Raman spectroscopy (SERS) is an extremely sensitive non-linear method to detect vibrational energy levels of molecules using visible light. However, most SERS substrates available today are quite inhomogeneous.

Here we provide experimental evidence of an efficient and homogeneous SERS substrate consisting of numerically evolutionary optimized two-dimensional gratings made from straight monocrystalline metal wires. The combination of grating resonance and plasmonic gap resonance allows to enhance both excitation of the molecules and emission of the Raman signal, which have to be treated separately to unlock the full potential of SERS. Many experiments comparing gratings, materials and analytes will be presented to illustrate the underlying physical mechanisms and the huge potential for applications.