High index contrast photonic platforms for on-chip Raman spectroscopy

Ali Raza*, Stéphane Clemmen, Pieter Wuytens, Michiel De Goede, Amy S.K. Tong, Nicolas L.E. Thomas, Chengyu Liu, Jin Suntivich, Andre G. Skirtach, Sonia M. Garcia-Blanco, Daniel J. Blumenthal, James S. Wilkinson, Roel Baets

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

48 Citations (Scopus)
110 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)23067-23079
Number of pages13
JournalOptics express
Issue number16
Publication statusPublished - 5 Aug 2019


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