The method of building micro-structures on the surface of certain materials could build a regular structure on the surface of the material to ensure the consistency of the material surface hydrophobic properties. In this paper, the all-optical method has been applied to produce two-dimensional surface relief grating on the surface of fluorine-containing azobenzene polymer film by using this method as an approach combined with the material’s properties of photoresponsive and low surface energy. The hydrophobic property of the final “two dimensional surface relief grating” has also been tested. Period combinations of 500nm×500nm, 500nm×600nm, 600nm×700nm, 700nm×800nm and the other eleven has been used to fabricate two-dimensional surface relief grating and their final results have been compared. The results show that, for the same period of grating, the contact angle becomes larger with the increase of the modulation depth. However, the contact angle becomes smaller as the grating period increases. Above all, the period and modulation depth of two-dimensional grating have a great impact on the hydrophobicity.
Blazed grating is a key diffractive optical element in spectrometer. Different from the traditional holographic ion beam etching method, blazed grating has been fabricated on a novel polymer with cyclic-azobenzene pendants (Pcyclic-azoMMA) by all optical fabrication with two steps in this paper. Firstly, use two interfering Kr+ laser beams with the most efficient RCP+LCP polarization to inscribe symmetric surface relief gratings on polymer film. After that, make a single laser beam with polarization perpendicular to the grating grooves irradiate slantly to induce blazed asymmetric structure. The distribution of the near field of the grating while single linearly polarized beam irradiate slantly at different angles was simulated. The calculation demonstrates that -1st order diffraction efficiency of blazed gratings is similar to that of triangle blazed grating.