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Polarization- and Wavelength-Dependent Surface-Enhanced Raman Spectroscopy Using Optically Anisotropic Rippled Substrates for Sensing
Citation key doi:10.1021/acssensors.5b00176
Author Gkogkou, Dimitra and Schreiber, Benjamin and Shaykhutdinov, Timur and Ly, Hoang Khoa and Kuhlmann, Uwe and Gernert, Ulrich and Facsko, Stefan and Hildebrandt, Peter and Esser, Norbert and Hinrichs, Karsten and Weidinger, Inez M. and Oates, Thomas W. H.
Pages 318-323
Year 2016
DOI 10.1021/acssensors.5b00176
Journal ACS Sensors
Volume 1
Number 3
Abstract Anisotropic Ag nanoparticle arrays were created by metal evaporation on rippled silicon templates for sensing of molecules with surface-enhanced Raman spectroscopy. Our results show that these substrates can be used for analysis of complex molecular mixtures and discrimination of solvent molecules. These properties are due to their polarization and wavelength dependency that provide enhancement in a wide spectral range. The dielectric function parallel and perpendicular to the long axis of the nanostructures was determined via ellipsometry yielding two different plasmonic resonances. Polarized surface-enhanced raman scattering (SERS) was subsequently measured as a function of the polarization angle θ for a 4-mercaptobenzonitrile self-assembled monolayer covalently attached to the Ag surface. For 514 nm excitation a cos2 θ-dependence and for 647 nm excitation a sin2 θ-dependency were found, with the maxima expressing the resonances perpendicular and parallel to the ripples, respectively. Those results open the path for using such a substrate as a chemical sensor providing strong enhancement in a broad range of laser wavelengths on only one sensing surface and increasing the specificity by matching resonant Raman conditions.
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