Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Plasmonics IV (joint session O/CPP)
CPP 42.7: Vortrag
Mittwoch, 3. April 2019, 16:30–16:45, H8
How Metal Nanoantennas’ Optical Properties Affect Surface Enhanced Infrared Absorption — •Michael Tzschoppe, Christian Huck, Jochen Vogt, Frank Neubrech, and Annemarie Pucci — Kirchhoff Institute for Physics, Heidelberg University, Germany
Surface enhanced infrared absorption (SEIRA) is known as a powerful tool to study tiny amounts of molecules on the basis of enhanced vibrational signals. In order to further increase the enhancement, the impact of the structures’ geometry as well as their interaction have been intensively investigated within the last decade.1,2 We present an experimental study with focus on the impact of the nanoantennas’ metal-optical properties on SEIRA sensitivity. Various aspect ratios of nanoantennas made of the metals gold, silver, copper, aluminum, and iron, respectively, were inspected. From the measured fundamental plasmonic resonance spectra the contributions of the intrinsic damping (electron scattering) as well as the radiative damping (light scattering) were evaluated. The SEIRA enhancement factors were determined for a thin organic probe layer. These investigations finally yield the correlation between the ratio of intrinsic damping and radiation damping with the SEIRA enhancement, which clearly shows the maximum enhancement when both damping mechanisms contribute equally.3
Neubrech et al. Chem. Rev. 2017, 117 (7), 5110
Dong et al. Nano Lett. 2017, 17 (9), 5768
Tzschoppe et al. J. Phys. Chem. C 2018, 122 (27), 15678