Journal
NANO LETTERS
Volume 21, Issue 4, Pages 1815-1821Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04902
Keywords
Dielectric metasurfaces; spin decoupling; chiral meta-atoms; meta-hologram
Categories
Funding
- National Key R&D Program of China [2016YFA0202103, 2017YFA0303701]
- National Natural Science Foundation of China [91850204, 11674167]
- Dengfeng Project B of Nanjing University
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Manipulating spin light using metasurfaces with controlled geometric phase has been successful, especially with the introduction of local phase manipulation technique with planar chiral meta-atoms, which enhances the flexibility and functionality of spin light control in metasurface designs.
Spin light (i.e., circularly polarized light) manipulation based on metasurfaces with a controlled geometric phase (i.e., Pancharatnam-Berry (PB) phase) has achieved great successes according to its convenient design and robust performances, by which the phase control is mainly determined by the rotation angle of each meta-atom. This PB phase can be regarded as a global effect for spin light; here, we propose a local phase manipulation for metasurfaces with planar chiral meta-atoms. Planar chiral meta-atoms break fundamental symmetry restrictions and do not need a rotation for these kinds of meta-atoms to manipulate the spin light, which significantly expands the functionality of metasurface as it is incorporated with other modulations (e.g., PB phase, propagation phase). As an example, spin-decoupled holographic imaging is demonstrated with robust and broadband properties. Our work definitely enriches the design of metasurfaces and may trigger more exciting chiral-optics applications.
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