期刊
ADVANCED MATERIALS
卷 32, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001388
关键词
diffraction limit; flat lenses; hybrid perovskites; subwavelength focusing
类别
资金
- National Key Research and Development Program [2016YFA0201902]
- National Natural Science Foundation of China [51702219, 61975134]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515020051]
- Natural Science Foundation of Jiangsu Province [BK20150053]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20180305125345378]
- Shenzhen Nanshan District Pilotage Team Program [LHTD20170006]
- Australian Research Council (ARC) [FT150100450, IH150100006, CE170100039, IC180100005]
Ultrathin flat lenses based on metasurfaces or metamaterials have shown great promise in recent years as essential components in nano-optical system, with capability of abrupt changes of light wavefronts. However, such structural designs require complex nanopatterns and a time-consuming nanofabrication process. In this regard, flat lenses are developed based on 2D perovskite nanosheets, using a cost-effective mask-free femtosecond direct laser writing system. The optical properties of the 2D perovskite are rationally adjusted through facile composition engineering as well as thickness-dependent quantum-size confinement. A diffraction theory model is derived to understand the focusing mechanism of the 2D perovskite nanosheets flat lenses. The as-fabricated lenses exploit the tunable material property variations to effectively manipulate not only the amplitude but also the phase of the incident light to focus into a 3D focal spot with a sub-wavelength resolution in the range of 0.5-0.9 lambda. The results pave the way toward low-cost and large-scale high-resolution imaging applications in the future.
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