The investigation of the two-dimensional surface relief grating on dye-doped polymer film

摘要

Two-dimensional surface relief grating (2D-SRG) on azo-dye doped polymer film (DDPF) was fabricated using the two-step of holographic writing technique. The groove structure of the 2D-SRG was dependent on the rotational angle of the two-step of writing, and the depth of the groove could be enhanced about 2~3 times by using nematic liquid crystal as the interface. The surface modulation of groove on DDPF with or without the interface of nematic liquid crystal depending on the polarization of the writing beams is also discussed. As the rotational angle between the two steps of writing was increased, the depth of the groove was gradually decreased for the writing beams with the S-polarization in the second step of writing, while increasing for the writing beams with the P-polarization.