Powerless and Reversible Color Humidity Sensor

One dimensional (1D) Photonic crystals (PC) are the simplest form of PC consisting of alternative layers of materials having different refractive indices. This periodic structure has very interesting optical properties allowing manipulation and control of light reflectance wavelength. Polymers have already been used as optical components in several devices and recently became candidate materials for the fabrication of PC. In the present work, a polymeric multilayer stack consisting of alternating hydrophobic and hydrophilic layers is fabricated and its response in controlled concentrations of humidity is evaluated towards the development of an optical humidity sensor