| Full text | |
| Author(s): |
Sun, Qian
[1]
;
Liang, Haowen
[1, 2]
;
Zhang, Jianchao
[1]
;
Feng, Weibin
[1]
;
Martins, Emiliano R.
[3]
;
Krauss, Thomas F.
[4]
;
Li, Juntao
[1]
Total Authors: 7
|
| Affiliation: | [1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Sch Phys, Guangzhou 510275 - Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519080 - Peoples R China
[3] Univ Sao Paulo, Dept Elect & Comp Engn, Sao Carlos Sch Engn, BR-13566590 Sao Carlos, SP - Brazil
[4] Univ York, Dept Phys, York YO10 SDD, N Yorkshire - England
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | ADVANCED OPTICAL MATERIALS; v. 9, n. 11 APR 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Dielectric metasurfaces have significant potential for delivering miniaturized optical systems with versatile functionalities, leading to applications in various fields such as orbital angular momentum generation, imaging, and holography. Among the different materials, crystalline silicon has the advantage of technological maturity and high refractive index, which increases design flexibility and processing latitude. The second, and often overlooked, advantage of silicon is that it affords embedding the metasurface in a protective material such as silica, which is essential for practical applications. The trade-off against this high refractive index is silicon's absorption at visible wavelength, which requires new design strategies. Here, such a strategy based on metasurfaces supporting air modes is identified that can lead to a transmission efficiency as high as 87% at a wavelength of 532 nm. This exceptional efficiency is obtained by using the high index to confine the electric field in the periphery of the meta-atoms, thereby reducing absorption losses. As an example, the design of a fully embedded metasurface is described that can generate vortex beams with various orders of orbital angular momentum. It is envisioned that the proposed strategy paves the way for practical applications of high-efficiency metasurfaces based on crystalline silicon. (AU) | |
| FAPESP's process: | 20/00619-4 - Metasurfaces for imaging and sensing |
| Grantee: | Emiliano Rezende Martins |
| Support Opportunities: | Regular Research Grants |