Demonstrates the optical sensors fabrication by printing the corresponding sensitive optical waveguides directly onto a flat substrate. Humidity-sensitive polymeric waveguides have been printed towards breathing sensing. The optical sensitive waveguides manufactured are compact, ensuring coupling with the input and output optical fibers. Unlike the traditional manufacturing process, any modification in the material, structure, dimensions, etc. of the sensitive optical waveguide can be carried out in a simple, low cost and extremely fast way.

Development of an integrated optoelectronic sensor for refractive index (RI) measurement, based on a zinc oxide metal–semiconductor–metal photodetector with electrohydrodynamic (EHD)-printed interdigitated electrodes and a polydimethylsiloxane (PDMS) waveguide placed on the sensor surface. The sensor detects variations in photocurrent caused by changes in the evanescent field of the PDMS waveguide when an analyte is deposited on it. The use of scalable techniques, such as EHD printing and sputtering, highlights the potential of the device as a compact and versatile sensing platform.