Photonic slot waveguides enhance light-matter interactions by confining the optical field in regions with a low refractive index, making them highly effective for detecting a wide range of biological and chemical analytes. This article reviews the application of photonic slot waveguides in biosensing and gas sensing, showcasing their ability to be integrated into on-chip platforms often intended for point-of-care testing with enhanced sensitivity and specificity. In biosensing, these waveguides are particularly suited for…

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