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Demonstrating low Raman background in UV-written SiO2 waveguides.

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    UV-written SiO2 waveguides offer a low Raman background for lab-on-a-chip devices. These waveguides show potential for single-particle chemical analysis, rivaling optical fibers.

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    Area of Science:

    • Optical sensing
    • Spectroscopy
    • Materials science

    Background:

    • Raman spectroscopy provides chemical fingerprints for inorganic and organic samples.
    • Lab-on-a-chip devices integrate microfluidics and optical sensors for miniaturized analysis.
    • Combining Raman spectroscopy with integrated optics (Raman-on-chip) offers advanced sensing capabilities.

    Purpose of the Study:

    • To demonstrate UV-written SiO2 waveguides as a low-background alternative for Raman-on-chip applications.
    • To compare the Raman background of UV-written SiO2 waveguides with optical fibers and Si3N4 waveguides.
    • To assess the potential of UV-written SiO2 waveguides for single-particle chemical composition measurement.

    Main Methods:

    • Fabrication of UV-written SiO2 waveguides designed to mimic optical fiber performance.
    • Measurement of Raman scattering in absolute units for different waveguide materials (SiO2, Si3N4) and optical fibers.
    • Analysis of Raman scattering sensitivity to pump wavelength and waveguide design.
    • Testing the signal-to-noise ratio (SNR) using a polystyrene bead for single-particle analysis.

    Main Results:

    • UV-written SiO2 waveguides exhibit significantly lower Raman background compared to Si3N4 waveguides.
    • Raman background levels for UV-written SiO2 waveguides were measured at -107.4 dB (785 nm pump) and -106.5 dB (660 nm pump).
    • The performance of UV-written SiO2 waveguides is comparable to optical fibers, with only a 8.7–10.3 dB higher background.
    • A peak SNR of 10.4 dB was achieved when analyzing a 7 µm polystyrene bead, demonstrating single-particle detection capability.

    Conclusions:

    • UV-written SiO2 waveguides present a promising low-background platform for Raman-on-chip devices.
    • This technology enables sensitive chemical analysis of single biological particles.
    • The developed waveguides offer a viable alternative to optical fibers for integrated Raman sensing.