Generation of an Axially Asymmetric Bessel-Like Beam from a Metallic Subwavelength Aperture
Generation of an Axially Asymmetric Bessel-Like Beam from a Metallic Subwavelength Aperture
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DOI：
10.1103/physrevlett.102.143901
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发表时间：
2009-04-10
影响因子：
8.6
通讯作者：
Ozbay, Ekmel
中科院分区：
文献类型：
--
作者：
Li, Zhaofeng;Alici, Kamil Boratay;Ozbay, Ekmel
通过在亚波长光阑前放置一个金属圆光栅状结构，产生了一束非衍射的电磁类贝塞尔光束。当入射波为线偏振时，光束是轴对称的。光束沿其纵轴具有波动但近似均匀的强度分布。光束的半峰全宽在近十个波长上保持小于两个波长。我们的实验结果与模拟结果和分析结果吻合得很好。
An electromagnetic nondiffractive Bessel-like beam from a subwavelength aperture is generated by placing a metallic circular gratinglike structure in front of the aperture. When the incident wave is linearly polarized, the beam is axially asymmetric. The beam possesses fluctuating, but approximately uniform, intensity distribution along its longitudinal axis. The full width at half maximum of the beam remains less than two wavelengths over nearly ten wavelengths. Our experimental results are in good agreement with the simulation results and analytical results.