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This tutorial aims to provide a general overview on the state-of-the-art of photonic integrated circuits (PICs) in the visible and short near-infrared (NIR) wavelength ranges, mostly focusing in silicon nitride (SiN) substrates, and a guide to the necessary steps in the design toward the fabrication of such PICs. The focus is put on bio- and life sciences, given the adequacy and, thus, a large number of applications in this field. [ABSTRACT FROM AUTHOR]

Highlights • SiN PICs are an promising platform to miniaturize optical biosensing systems. • Four foundries are offering open-access generic manufacturing. • Different methods for sensing where SiN PICs are used are presented. • PIX4life is presented as current driver of development of SiN PICs in the visible. • Systems on several applications mentioned: OCT, cytometry, sensors, light sources. Abstract In this article, we provide a review of fabrication platforms and state of the art developments in the area of silicon nitride photonic integrated circuits (PICs) for the visible wavelength range, mostly employed in bio-medical and chemical sensing applications. Additionally, we introduce PIX4life, the European pilot line for silicon nitride PICs for visible applications. PIX4life provides a unified framework for the development of such PICs, including design and software, fabrication, characterization and packaging. [ABSTRACT FROM AUTHOR]