Abstract
The focusing properties of fractal zone plates(FZPs) with different structure parameters are studied experimentally.The axial irradiance of FZPs is deduced at n = 4. The experimentalresults are in good agreement with the theoretical prediction. A methodto fabricate FZPs with variable structure parameters is mentioned, andthe liquid-crystal-on-silicon device is used to implement thisexperiment. The experimental results indicate that the focal depth oflower order FZPs is larger than that of higher order FZPs.
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