Longitudinal Multi-Channel Focused Vortex and Vector Beams Generation by Quarter-Wave Plate Meta-Atom Metasurfaces.

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Tác giả: Chuanfu Cheng, Qingrui Dong, Manna Gu, Chunxiang Liu, Li Ma, Teng Ma, Kaixin Zhao, Haoyan Zhou

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: Switzerland : Nanomaterials (Basel, Switzerland) , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 699024

Metasurface-based longitudinal modulation introduces the propagation distance as a new degree of freedom, extending the light modulation with metasurfaces from 2D to 3D space. However, relevant longitudinal studies have been constrained to designing the metasurface of half-wave plate (HWP) meta-atoms and generating either non-focused or two-channel vortex and vector beams. In this study, we propose a metasurface composed of quarter-wave plate (QWP) meta-atoms to generate the longitudinal multi-channel focused vortex and vector beams. The metasurface consists of two interleaved sub-metasurfaces of QWP meta-atoms. For each sub-metasurface, the helical and hyperbolic phase profiles are designed independently in the propagation and geometric phases to generate focused co- and cross-polarized vortices with corresponding topological charges. Under the illumination of
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