Ultraviolet Raman spectroscopy using multimode aluminum oxide waveguides
Abstract
Waveguide-based Raman spectroscopy offers a route toward compact and integrated photonic sensors. While most waveguide Raman platforms operate in the near-infrared, extending excitation toward the visible and ultraviolet is attractive because shorter excitation wavelengths can provide substantially stronger Raman scattering and access to resonance-enhanced molecular responses. This transition, however, places greater demands on the photonic material because of optical loss, absorption and waveguide-generated spectral background. Here, we investigate aluminum oxide (Al2O3) waveguides as a low-background platform for Raman spectroscopy at 532 nm and 325 nm using a back-collected excitation and detection geometry. At 532 nm, after normalization to the incident excitation power-time product, the measured Al2O3 background was more than two orders of magnitude lower than that of Si3N4. Under 325 nm excitation, the waveguides maintained a weak and reproducible spectral background across the investigated widths. Using immersion oil as a model analyte deposited over the waveguide surface, we demonstrate that analyte-specific Raman fingerprints can be recovered above the waveguide background at both wavelengths. Signal-to-background ratio and spectral contrast were used to quantify analyte visibility relative to the waveguide background, and both metrics consistently confirmed clear detection of the analyte bands. These results demonstrate that Al2O3 combines low measured spectral background with operation from the visible into the ultraviolet, providing a promising route toward integrated Raman spectroscopy at shorter excitation wavelengths.
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BibTeX
@misc{zakoldaev2026ultraviolet,
title = {{Ultraviolet Raman spectroscopy using multimode aluminum oxide waveguides}},
author = {Roman Zakoldaev and Nikhil Jayakumar and Elie Vennat-Bresson and Jean-Claude Tinguely and Firehun Tsige Dullo and Balpreet Singh Ahluwalia},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41503},
eprint = {2610.41503},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41503},
}
RIS
TY - UNPB
TI - Ultraviolet Raman spectroscopy using multimode aluminum oxide waveguides
AU - Roman Zakoldaev
AU - Nikhil Jayakumar
AU - Elie Vennat-Bresson
AU - Jean-Claude Tinguely
AU - Firehun Tsige Dullo
AU - Balpreet Singh Ahluwalia
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41503
UR - https://arxiv.org/abs/2610.41503
AB - Waveguide-based Raman spectroscopy offers a route toward compact and integrated photonic sensors. While most waveguide Raman platforms operate in the near-infrared, extending excitation toward the visible and ultraviolet is attractive because shorter excitation wavelengths can provide substantially stronger Raman scattering and access to resonance-enhanced molecular responses. This transition, however, places greater demands on the photonic material because of optical loss, absorption and waveguide-generated spectral background. Here, we investigate aluminum oxide (Al_2O_3) waveguides as a low-background platform for Raman spectroscopy at 532 nm and 325 nm using a back-collected excitation and detection geometry. At 532 nm, after normalization to the incident excitation power-time product, the measured Al_2O_3 background was more than two orders of magnitude lower than that of Si_3N_4. Under 325 nm excitation, the waveguides maintained a weak and reproducible spectral background across the investigated widths. Using immersion oil as a model analyte deposited over the waveguide surface, we demonstrate that analyte-specific Raman fingerprints can be recovered above the waveguide background at both wavelengths. Signal-to-background ratio and spectral contrast were used to quantify analyte visibility relative to the waveguide background, and both metrics consistently confirmed clear detection of the analyte bands. These results demonstrate that Al_2O_3 combines low measured spectral background with operation from the visible into the ultraviolet, providing a promising route toward integrated Raman spectroscopy at shorter excitation wavelengths.
ER -