One step inscription of surface relief microgratings

The one step storage of several gratings is achieved in a photoactive polymer material. The so-called surface relief microgratings are obtained with a liquid droplet deposited on top of a photosensitive thin film and encoded by a single coherent visible light laser beam. Photoinduced gratings have several pitches between 0.4 and 1.4 μm. We print gratings that would have required several exposures with UV light for printing using more traditional interference schemes.