Driven by the rich variety of molecular and atomic spectral features to probe in the NUV (near ultraviolet), photonic devices operating in this spectral range, like coherent sources and optical functions, may address multiple applications such as biosensing, environment, and security issues. Leveraging from mature semiconductor manufacturing industry, silicon photonics and in particular Silicon On Insulator (SOI) has emerged, over the past two decades, as the preferred technology for photonic integration. However, due to its low energy bandgap, Silicon strongly absorbs at wavelengths shorter than 1100 nm, prohibiting the use of SOI platform at near-UV wavelengths. To circumvent the Si absorption issue at short wavelengths, different materials, including Si₃N₄, Al₂O₃ or polymers, have been proposed to achieve low propagation loss in the blue and violet spectrum range.