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Authors: Y. Li, H. Zhao, A. Raza, S. Clemmen, R. Baets
Title: Surface-enhanced Raman spectroscopy based on plasmonic slot waveguides with free-space oblique illumination
Format: International Journal
Publication date: 2/2020
Journal/Conference/Book: Journal of Quantum Electronics
Editor/Publisher: IEEE, 
Volume(Issue): 56(1) p.paper 7200108 (8 pages)
DOI: 10.1109/jqe.2019.2946839
Citations: 1 (Web of Knowledge / Dimensions.ai - last update: 28/9/2020)
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Abstract

We report a novel on-chip approach for surface-enhanced Raman spectroscopy (SERS) using a plasmonic slot waveguide. The Raman signal is excited by free-space excitation and is collected by the waveguide. A significant signal-to background-ratio (SBR) enhancement, compared to the case of back-scattered Raman spectroscopy with waveguide-mode excitation, is demonstrated on a silicon nitride plasmonic slot waveguide with a 7-mm access waveguide. The flexible adjustment of the incident angle in free space and modification of waveguide geometry enables the further optimization of the pump-to-Stokes conversion efficiency. The combination of high SBR and long access waveguide allows the integration with additional photonics devices (sources, filters, spectrometers) on the same chip.

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