Device and method for implementing a photo-spectrometer unit, PSU (20), for use with a spectrometry system (100) having optical means (12), and electronic means (13) including detection means (15, 25, 25j) and processing means (16, 26, 26k). The PSU is formed in a first manufacturing process step into a monolithic structure as a chip of substrate material (30) including integrally formed optical means, and has a first input surface (301) separated from a second receiving surface (302) by a substrate material thickness (t). Electronic means are formed onto the PSU structure in a second manufacturing process step. The substrate material is selected as a material transparent to electromagnetic radiations, and the PSU has at least one optical deflecting element (32) configured for guiding received radiations through the thickness of the substrate material, for establishing direct optical path coupling between both an element formed on one surface and an element formed on another surface of the substrate material.
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