globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.08.043
论文题名:
Large second-harmonic vortex beam generation with quasi-nonlinear spin–orbit interaction
作者: Zhao W.; Wang K.; Hong X.; Wang B.; Han X.; Wang K.; Liu W.; Long H.; Wang B.; Lu P.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期:5
起始页码: 449
结束页码: 456
语种: 英语
中文关键词: Metalenses ; Monolayer WS2 ; Orbital-angular momentum ; Plasmonic metasurface ; Second-harmonic generation
英文关键词: Angular momentum ; Degrees of freedom (mechanics) ; Harmonic analysis ; Optical communication ; Topology ; Tungsten compounds ; Degree of freedom ; Encoding informations ; Excitation wavelength ; Harmonic frequency ; Orbital angular momentum ; Second and third harmonics ; Spiral phase plates ; Topological charges ; Vortex flow
英文摘要: A harmonic vortex beam is a typical vector beam with a helical wavefront at harmonic frequencies (e.g., second and third harmonics). It provides an additional degree of freedom beyond spin- and orbital-angular momentum, which may greatly increase the capacity for communicating and encoding information. However, conventional harmonic vortex beam generators suffer from complex designs and a low nonlinear conversion efficiency. Here, we propose and experimentally demonstrate the generation of a large second-harmonic (SH) vortex beam with quasi-nonlinear spin–orbit interaction (SOI). High-quality SH vortex beams with large topological charges up to 28 are realized experimentally. This indicated that the quasi-angular-momentum of a plasmonic spiral phase plate at the excitation wavelength (topological charge, q) could be imprinted on the harmonic signals from the attached WS2 monolayer. The generated harmonic vortex beam has a topological charge of ln=2nq (n is the harmonic order). The results may open new avenues for generating harmonic optical vortices for optical communications and enables novel multi-functional hybrid metasurface devices to manipulate harmonic beams. © 2020 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170519
Appears in Collections:气候变化与战略

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作者单位: Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China; Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, 430205, China; Guangdong Intelligent Robotics Institute, Dongguan, 523808, China; CAS Center for Excellence in Ultra-intense Laser Science, Shanghai, 201800, China

Recommended Citation:
Zhao W.,Wang K.,Hong X.,et al. Large second-harmonic vortex beam generation with quasi-nonlinear spin–orbit interaction[J]. Science Bulletin,2021-01-01,66(5)
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