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Cascaded metasurfaces for high-purity vortex generation.
Mei, Feng; Qu, Geyang; Sha, Xinbo; Han, Jing; Yu, Moxin; Li, Hao; Chen, Qinmiao; Ji, Ziheng; Ni, Jincheng; Qiu, Cheng-Wei; Song, Qinghai; Kivshar, Yuri; Xiao, Shumin.
Affiliation
  • Mei F; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Qu G; Pengcheng Laboratory, 518055, Shenzhen, Guangdong, P. R. China.
  • Sha X; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Han J; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Yu M; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Li H; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Chen Q; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Ji Z; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China.
  • Ni J; Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore, Singapore.
  • Qiu CW; Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore, Singapore.
  • Song Q; Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, 518055, Shenzhen, P. R. China. qinghai.song@hit.edu.cn.
  • Kivshar Y; Pengcheng Laboratory, 518055, Shenzhen, Guangdong, P. R. China. qinghai.song@hit.edu.cn.
  • Xiao S; Nonlinear Physics Center, Research School of Physics, Australian National University, Canberra, ACT2601, Australia. yuri.kivshar@anu.edu.au.
Nat Commun ; 14(1): 6410, 2023 Oct 12.
Article de En | MEDLINE | ID: mdl-37828022
We introduce a new paradigm for generating high-purity vortex beams with metasurfaces. By applying optical neural networks to a system of cascaded phase-only metasurfaces, we demonstrate the efficient generation of high-quality Laguerre-Gaussian (LG) vortex modes. Our approach is based on two metasurfaces where one metasurface redistributes the intensity profile of light in accord with Rayleigh-Sommerfeld diffraction rules, and then the second metasurface matches the required phases for the vortex beams. Consequently, we generate high-purity LGp,l optical modes with record-high Laguerre polynomial orders p = 10 and l = 200, and with the purity in p, l and relative conversion efficiency as 96.71%, 85.47%, and 70.48%, respectively. Our engineered cascaded metasurfaces suppress greatly the backward reflection with a ratio exceeding -17 dB. Such higher-order optical vortices with multiple orthogonal states can revolutionize next-generation optical information processing.

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Nat Commun Sujet du journal: BIOLOGIA / CIENCIA Année: 2023 Type de document: Article Pays de publication: Royaume-Uni

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Nat Commun Sujet du journal: BIOLOGIA / CIENCIA Année: 2023 Type de document: Article Pays de publication: Royaume-Uni