Abstract
Gabor zone plate (GZP) is typical amplitude-type diffractive lenses for high-resolution imaging. Compared with Fresnel zone plates (FZP), GZP can suppress all higher-order foci and shows better focusing performance. However, the focusing efficiency of GZP is very low and the cosine variation of its transmittance is difficult to satisfy. In order to improve these disadvantages, many kinds of improved Gabor zone plates are designed. However, the focusing efficiency of these Gabor zone plates are ~10%, which is still too low. A phase-type diffractive lens based on the Gabor zone plate is designed to improve the focusing efficiency of GZP, in which the radial distribution of microstructure varies in a cosine pattern. Simulation results show that the focusing efficiency of the Gabor-type diffractive lens (GDL) can reach ~22%, which is much higher than that of GZP. In addition, we also analyze the effect of errors of laser direct writing on the focusing efficiency of GDL and Fresnel-type diffractive lens (FDL). The results show that the focusing efficiency of GDL shows higher tolerance for the error of laser direct writing than that of FDL.
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