High efficiency multilevel phase-type fractal zone plates
High efficiency multilevel phase-type fractal zone plates
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DOI：
10.1364/ol.33.002913
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发表时间：
2008-12-15
期刊：
影响因子：
3.6
通讯作者：
Sun, Hong-Bo
中科院分区：
文献类型：
--
作者：
Wu, Dong;Niu, Li-Gang;Sun, Hong-Bo
采用飞秒激光双光子聚合技术，在数十分钟内快速制备了三种高效相型分形带片。其理论最大衍射效率分别为24.5%、12.52%和18.76%，通过数值模拟和分析推导得到，实测值分别为20.5%、9.1%和13%。并论证了相型分形透镜的多焦特性和成像能力的提高。为进一步提高衍射效率，提出并实现了衍射效率高达37.6%的四级分形相透镜。(C) 2008美国光学学会
Three kinds of high efficiency phase-type fractal zone plates were rapidly (in tens of minutes) fabricated by femtosecond laser two-photon photopolymerization. Their theoretical maximal diffractive efficiencies of 24.5%, 12.52%, and 18.76%, were predicted both by numerical simulation and analytical deduction and were verified by the measured values of 20.5%, 9.1%, and 13%, respectively. The characteristic of multifoci and the improved imaging ability for phase-type fractal lens was also demonstrated. Moreover, to further enhance the diffractive efficiency, a four-level fractal phase lens, whose diffraction efficiency reached as high as 37.6%, was proposed and realized. (C) 2008 Optical Society of America