期刊
PHYSICAL REVIEW B
卷 97, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.245426
关键词
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资金
- Wuhan Morning Light Plan of Youth Science and Technology [2017050304010324]
- National Natural Science Foundation of China [11574240, 11774273]
- Outstanding Youth Funds of Hubei Province [2016CFA034]
- Open Foundation of State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts and Telecommunications [OCTN-201605]
Subwavelength spatial control of phase using metasurfaces is attractive for practical applications such as flat lens, vector beam generator, ultrathin wave-plate and high-resolution holography. All-dielectric metasurfaces provide two phase modulation mechanisms, which are propagation phase dependent on the dimension of meta-atoms and geometric phase dependent on the orientation of meta-atoms. Recently, it was proposed that by combining geometric phase and propagation phase, arbitrary and independent phase profiles can be imposed on a pair of orthogonal polarizations. However, a succinct expression of phase change introduced during an arbitrary polarization conversion process has not been presented. Here, we derive the geometric phase for the general case of nonorthogonal polarization conversions. Through the numerical simulations of a metasurface orbital angular momentum generator under both circular and elliptical polarization illuminations, we verify our theoretical analyses. This work presents the mechanism of controlling polarization and phase of arbitrary polarizations using both geometric phase and propagation phase, which exhibits the potential to enrich the capacity of polarization multiplexed metasurfaces.
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