Incomplete Phase Metasurface for Wavefront Reconstruction

Incomplete Phase Metasurface for Wavefront Reconstruction

ACS Photonics

10.1021/acsphotonics.3c00275

http://dx.doi.org/10.1021/acsphotonics.3c00275

Qiyao Liu, Zhengtong Liu, Xuezhi Ma, Jie Deng, Chen Zhang, Zhenmin Chen, Arash Nemati, Sui Kit Ng, Sergey Gorelik, Siew Lang Teo, Rong Ji, Meng Zhao, Leonard Verano Gonzaga, Hong Liu, Fuyong Yue, Shaohua Yu, Yu Luo, Qian Wang

metasurface, grating, Flat optics

10 July 2023

Liu, Q., Liu, Z., Ma, X., Deng, J., Zhang, C., Chen, Z., Nemati, A., Ng, S. K., Gorelik, S., Teo, S. L., Ji, R., Zhao, M., Gonzaga, L. V., Liu, H., Yue, F., Yu, S., Luo, Y., & Wang, Q. (2023). Incomplete Phase Metasurface for Wavefront Reconstruction. ACS Photonics, 10(8), 2563–2569. https://doi.org/10.1021/acsphotonics.3c00275

Metasurfaces consisting of subwavelength elements exhibit unparalleled flexibility in light manipulation in terms of phase, amplitude, and/or polarization at ultrathin dimensions. Typically, a continuous and complete phase distribution covering a full 2π range is required in metasurface design to produce the performance of conventional optical components, such as gratings, lenses, and beam splitters. However, an incomplete phase, i.e., with phase change less or larger than 2π, can provide additional degrees of freedom for optical wavefront reconstruction. This article shows that designed metagratings, which unlocked the 2π phase constraint in supercell designs, achieved arbitrary control of the intensity ratio between any adjacent diffraction orders, while keeping the diffraction directions consistent with those of conventional gratings. Four metagratings, as representatives, with different phase ranges in the supercell, i.e., π, 2π, 3π, and 4π, have been designed and fabricated to demonstrate the diffraction intensity redistribution capability of metagratings. The 0th- and the 1st-order splitting ratios measured in experiments can reach 0.07 to 24.8, which is a hard task for traditional grating devices. Using a simple design methodology, incomplete phase metasurfaces hold great promise for developing various functional ultrathin nanophotonic devices, such as controllable beam splitters, spectrometers, and multifoci metalens.

Publisher Copyright

This research / project is supported by the A*STAR - AME Individual Research Grants (IRG) Fund
Grant Reference no. : A20E5c0095, M22K2c0080

This research / project is supported by the A*STAR - Career Development Fund
Grant Reference no. : C210112044 and C210812027

This research / project is supported by the A*STAR - Career Development Fund-Seed Projects
Grant Reference no. : 222D800038

This research / project is supported by the A*STAR - AME programmatic Fund
Grant Reference no. : A18A7b0058

This research was also supported by the Major Key Project of PCL, and the Talent Program of Guangdong Province (Grant No. 2021CX02X465).

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi.org/10.1021/acsphotonics.3c00275

https://oar.a-star.edu.sg/communities-collections/articles/19517

2330-4022

Institute of Materials Research and Engineering