光学
振幅
调幅
旋涡
偏振器
栅栏
波长
调制(音乐)
物理
频率调制
带宽(计算)
电信
计算机科学
声学
梁(结构)
双折射
作者
Xin Shan,Zile Li,Liangui Deng,Qi Dai
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2020-02-25
卷期号:45 (7): 1902-1902
被引量:17
摘要
Metasurfaces, acting as arrays of perfect nano-polarizers, provide a promising approach to manipulate the amplitude of an incident light at the sub-wavelength scale. In this Letter, we design and demonstrate continuous amplitude-modulated meta-fork gratings to generate optical vortex beams. More importantly, benefiting from the unique negative amplitude modulation, the unavoidable zero-order light that conventional amplitude-only elements always suffer disappears by carefully adjusting the orientation of each nanobrick. The dramatically dropped zero-order light with only 3% leakage energy verifies our design. With the advantages of continuous amplitude modulation, zero-order extinction, and super-high resolution, the proposed meta-fork grating will have a widespread application in integrated optical vortex manipulation and promote the emergence of many other amplitude-modulated nano-optical devices.
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