摘要
A fllll-transparent zone plate （FTZP）, which can reuse tile wave blocked in the focusing of the Fresncl zone plate （FZP）, is proposed to improve the efficiency of terahertz （THz） focusing without aberration. We find that the substrate thickness of the FTZP has a great influence on the focusing intensity, which results from file Fabry-Perot effect. Tile focusing efficiency of FTZPs could be about twice as high as that of FZPs. but the widths of both focus spots are comparable with the wavelength. The experimental results are in good agreement with the simulation.
A fllll-transparent zone plate （FTZP）, which can reuse tile wave blocked in the focusing of the Fresncl zone plate （FZP）, is proposed to improve the efficiency of terahertz （THz） focusing without aberration. We find that the substrate thickness of the FTZP has a great influence on the focusing intensity, which results from file Fabry-Perot effect. Tile focusing efficiency of FTZPs could be about twice as high as that of FZPs. but the widths of both focus spots are comparable with the wavelength. The experimental results are in good agreement with the simulation.
作者
Hui Yin
Jiaqi Li
Huawei Liang
Min Zhang
Hong Su
Ireng Ling Li
尹慧;李佳奇;梁华伟;张敏;苏红;李玲(Shenzhen Key Laboratory of Laser Engineering,Shenzhen University,Shenzhen 518060,China;Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,Shenzhen University Shenzhen 518060 China)
基金
supported in part by the National Natural Science Foundation of China(No.61405124)
the Fund Project for Shenzhen Fundamental Research Programme,China(No.JCYJ20170818143652693)
the Major Science and Technology Project of Guangdong Province(No.2014B010131006)
