| Full text | |
| Author(s): Show less - |
Zhang, Jianchao
;
Liang, Haowen
;
Long, Yong
;
Zhou, Yongle
;
Sun, Qian
;
Wu, Qinfei
;
Fu, Xiao
;
Martins, Emiliano R.
;
Krauss, Thomas F.
;
Li, Juntao
;
Wang, Xue-Hua
Total Authors: 11
|
| Document type: | Journal article |
| Source: | LASER & PHOTONICS REVIEWS; v. 16, n. 9, p. 8-pg., 2022-07-21. |
| Abstract | |
Metalens research has made major advances in recent years. These advances rely on the simple design principle of arranging meta-atoms in regular arrays to create an arbitrary phase and polarization profile. Unfortunately, the concept of equally spaced meta-atoms reaches its limit for high deflection angles where the deflection efficiency decreases. The efficiency can be increased using nano-antennas with multiple elements, but their polarization sensitivity hinders their application in metalenses. Here, it is shown that by designing polarization-insensitive dimer nano-antennas and abandoning the principle of equally spaced unit cells, polarization-insensitive ultrahigh numerical aperture (NA = 1.48) oil-immersion operation with an efficiency of 42% can be demonstrated. This represents a significant improvement on other polarization-insensitive designs at visible wavelength. This single layer metalens is used to replace a conventional objective lens and demonstrates the confocal scanning microscopic imaging of a grating with a period of 300 nm at 532 nm operating wavelength. Overall, the results experimentally demonstrate a novel design concept that further improves metalens performance. (AU) | |
| FAPESP's process: | 21/06121-0 - Electromagnetic wave propagation through complex structures |
| Grantee: | Ben-Hur Viana Borges |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 20/00619-4 - Metasurfaces for imaging and sensing |
| Grantee: | Emiliano Rezende Martins |
| Support Opportunities: | Regular Research Grants |