Preparation of Period-tunable Grating Film

The groove micro-structure of compact disc was copied by the template technology,and the period-tunable PDMS grating film was prepared.The PDMS film was stretched,making it periodically varied.The grating constant of the duplicate film was measured by laser-grating diffraction method.By using microscopy,the micro-structure was characterized.The results indicate that the grating diffraction phenomenon of the grating film is remarkable during the stretching.The diffraction experiment of the grating indicates that an extension of 16 % has been obtained.Obviously,the grating prepared in this manner is inexpensive and simple to operate.