1. Broadband meta-converters for multiple Laguerre-Gaussian modes
- Author
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Yu-Xuan Ren, Kenneth K. Y. Wong, Xiankai Sun, Zejie Yu, Huade Mao, Yue Yu, and Shuang Zhang
- Subjects
Diffraction ,business.industry ,Gaussian ,Phase (waves) ,Physics::Optics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Azimuth ,symbols.namesake ,Amplitude ,Optics ,Modulation ,symbols ,business ,Phase modulation ,Beam (structure) - Abstract
Metasurface provides miniaturized devices for integrated optics. Here, we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian (LG) modes of different orders at various diffraction angles. The metasurface is fabricated with Au nano-antennas, which vary in length and orientation angle for modulation of both the phase and the amplitude of a scattered wave, on a silica substrate. Our error analysis suggests that the metasurface design is robust over a 400 nm wavelength range. This work presents the manipulation of LG beams through controlling both radial and azimuthal orders, which paves the way in expanding the communication channels by one more dimension (i.e., radial order) and demultiplexing different modes.
- Published
- 2021
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