Affiliation:
1. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices
2. South China Normal University
3. Sun Yat-Sen University
Abstract
In this paper, we propose a bilayer metasurface with dual-operating
modes to realize the generation and conversion of dual-band
Laguerre-Gaussian beam with different OAM. The bilayer metasurface
consists of amorphous silicon (a-Si) and amorphous antimony selenide
(a-Sb2Se3). In transmission mode, the
metasurface can transform incident left-handed circularly polarized
(LCP) Gaussian beam into one LCP Laguerre-Gaussian beam carrying
topological charge l=−2 and one right-handed
circularly polarized (RCP) Laguerre-Gaussian beam carrying topological
charge l=−1, which enabled OAM modes multiplexing. In
reflection mode, the metasurface can convert an incident LCP Gaussian
beam into a LCP Laguerre-Gaussian beam carrying a topological charge
l=−3 owing to the a-Sb2Se3
nanopillar that acts as a half-wave plate with high reflectivity. In
addition, the OAM conversion between two arbitrary modes can be
realized by the proposed metasurface. This work provides a valid
method for OAM multiplexing and conversion, which holds a great
applications value in high-speed optical communication systems.
Funder
National Natural Science Foundation of
China
Natural Science Foundation of Guangdong
Province
Science and Technology Program of
Guangzhou
Subject
Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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