Journal
MATERIALS
Volume 14, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/ma14092147
Keywords
quasi-continuous; metasurface; all-metallic; diffraction limit
Categories
Funding
- National Natural Science Foundation of China [61905073]
- Fundamental Research Funds for the Central Universities [531118010189]
- Opening Fund from the State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences [SKLOTNM-KFS2019-1]
Ask authors/readers for more resources
This study introduces an all-metallic reflective metasurface composed of numerous quasi-continuous nanostructures, achieving high-efficiency and broadband focusing performance. Through the same design strategy, a quasi-continuous metasurface with the ability to overcome the diffraction limit is also demonstrated, achieving a focal spot with a size of 0.8 times the diffraction limit.
Benefitting from the arbitrary and flexible light modulation, metasurface has attracted extensive attention and been demonstrated in different applications. However, most reported metasurface-based devices were normally composed of discrete micro or nano structures, therefore the discretization precision limited the performance of the device, including the focusing efficiency, stray light suppression, and broadband performance. In this work, an all-metallic reflective metasurface consisting of numerous quasi-continuous nanostructures is proposed to realize high-efficiency and broadband focusing. The constructed quasi-continuous metasurface (QCMS) is then verified numerically through electromagnetic simulation, and the numerical results show a higher focusing efficiency and a better stray light suppression effect, compared to a binary-phase-based metalens. Through the same design strategy, a QCMS with the ability to overcome the diffraction limit can also be constructed, and a focal spot with the size of 0.8 times the diffraction limit can be achieved. We expect that this quasi-continuous structure could be utilized to construct other high-performance devices that require continuous phase controls, such as the beam deflector, orbital angle momentum generator, and self-accelerating beam generator.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available