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High index contrast photonic platforms for on-chip Raman spectroscopy

Authors
  • Raza, Ali
  • Clemmen, Stéphane
  • Wuytens, Pieter
  • de Goede, Michiel
  • Tong, Amy SK
  • Le Thomas, Nicolas
  • Liu, Chengyu
  • Suntivich, Jin
  • Skirtach, Andre
  • Garcia-Blanco, Sonia M
  • Blumenthal, Daniel J
  • Wilkinson, James S
  • Baets, Roel
Publication Date
Jan 01, 2019
Identifiers
DOI: 10.1364/oe.27.023067
OAI: oai:archive.ugent.be:8626690
Source
Ghent University Institutional Archive
Keywords
Language
English
License
Unknown
External links

Abstract

Nanophotonic waveguide enhanced Raman spectroscopy (NWERS) is a sensing technique that uses a highly confined waveguide mode to excite and collect the Raman scattered signal from molecules in close vicinity of the waveguide. The most important parameters defining the figure of merit of an NWERS sensor include its ability to collect the Raman signal from an analyte, i.e. "the Raman conversion efficiency" and the amount of "Raman background" generated from the guiding material. Here, we compare different photonic integrated circuit (PIC) platforms capable of on-chip Raman sensing in terms of the aforementioned parameters. Among the four photonic platforms under study, tantalum oxide and silicon nitride waveguides exhibit high signal collection efficiency and low Raman background. In contrast, the performance of titania and alumina waveguides suffers from a strong Raman background and a weak signal collection efficiency, respectively.

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