Abstract The research illustrates how the case studies related to the theme of "logistics in fashion manufacturing" could be targeted to emphasize the user interaction with the product system. Radio-waves technologies as RFID and NFC represent a crucial key topic in fashion supply-chain traceability. Emerging technologies as photonics could represents a new step in production authenticity identification working in between advanced manufacturing processes and user experience. So advanced machines and instruments could incorporate by themselves an identification system. So, the user interaction could represent a new step of product authenticity certification. The research path focuses on product interaction according with the innovation processes fashion accessories, taking into account possible extension of supply chain innovation to the product and related user experience. This strategy focuses on the state of the art of advanced technologies already present in this manufacturing sector (i.e. laser, CNC machinery), relying on the ability of SMEs to technology transfer and cross fertilization flexibility. Laser cutting process could be implemented by photonics, so the photon beam could define a high-precision engraving on materials as metal components for fashion accessories (from micro to nano-engraving). The project uses the technologies of optical diffraction as implementation of the artifact. From photon engraving we can create optics with miniature incisions that allow light to pass through a type of hologram numerical control structures in which complex visualization have been engraved in small thin slabs. This process is therefore based on a structure in low relief with a depth of about one micro-meter, more or less the same wavelength of light. This structure is producing an effect of micro-knurling. Through an external light source, working in refraction of a knurled surface with diffractive optics (refraction angle of +/-30 °), the user can project an image on an adjacent surface that illustrates or emphasizes contents related to the product. The process of diffractive surfaces “printing” could be provided by machines and technologies already involved in the supply chain. The research is aiming at optimizing these tools through photonics technologies. The user, by an external light source as a laser light, can create a projection by the accessory understanding tangible and intangible values related to the manufacturing steps, places and people involved in the production of the artefact. In addition, by checking the projection, the user is the final controller of product authenticity, against fake and not legal imitations.
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