TY - JOUR
T1 - Creating Composite Vortex Beams with a Single Geometric Metasurface
AU - Ming, Yang
AU - Intaravanne, Yuttana
AU - Ahmed, Hammad
AU - Kenney, Mitchell
AU - Lu, Yan-qing
AU - Chen, Xianzhong
N1 - Funding Information:
This project was funded by the Engineering and Physical Sciences Research Council (EP/P029892/1), the Leverhulme Trust (RPG‐2021‐145), and the Royal Society International Exchanges (IES\R3\193046). Y.M. acknowledges the funding from the National Natural Science Foundation of China (NSFC) (Grant Nos. 11704182, 62074019, and 62174016), and the sponsorship of Jiangsu Government Scholarship for Overseas Studies, 2019. Y.I. acknowledges the support from the Ministry of Higher Education, Science, Research and Innovation (Thailand), and the Royal Thai Embassy in London (UK).
Publisher Copyright:
© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.
PY - 2022/5/5
Y1 - 2022/5/5
N2 - Composite vortex beams (CVBs) have attracted considerable interest recently due to the unique optical properties and potential applications. However, these beams are mainly generated using spatial light modulators, which suffer from large volume, high cost, and limited resolution. Benefiting from the ultrathin nature and unprecedented capability in light manipulation, optical metasurfaces provide a compact platform to perform this task. A metasurface approach to creating these CVBs is proposed and experimentally demonstrated. The design is based on the superposition of multiple circularly polarized vortex beams with different topological charges, which is realized based on a geometric metasurface consisting of metallic nanorods with spatially variant orientations. The effects of the initial phases, amplitude coefficients, incident polarization state, and propagation distance on the generated CVBs, which are in good agreement with the theoretical prediction, are experimentally analyzed. This work has opened a new avenue for engineering CVBs with a minimal footprint, which has promising applications ranging from multiple optical traps to quantum science.
AB - Composite vortex beams (CVBs) have attracted considerable interest recently due to the unique optical properties and potential applications. However, these beams are mainly generated using spatial light modulators, which suffer from large volume, high cost, and limited resolution. Benefiting from the ultrathin nature and unprecedented capability in light manipulation, optical metasurfaces provide a compact platform to perform this task. A metasurface approach to creating these CVBs is proposed and experimentally demonstrated. The design is based on the superposition of multiple circularly polarized vortex beams with different topological charges, which is realized based on a geometric metasurface consisting of metallic nanorods with spatially variant orientations. The effects of the initial phases, amplitude coefficients, incident polarization state, and propagation distance on the generated CVBs, which are in good agreement with the theoretical prediction, are experimentally analyzed. This work has opened a new avenue for engineering CVBs with a minimal footprint, which has promising applications ranging from multiple optical traps to quantum science.
KW - composite vortex beams
KW - optical metasurfaces
KW - orbital angular momentum
KW - structured beams
UR - http://www.scopus.com/inward/record.url?scp=85127291648&partnerID=8YFLogxK
U2 - 10.1002/adma.202109714
DO - 10.1002/adma.202109714
M3 - Article
C2 - 35285566
SN - 0935-9648
VL - 34
JO - Advanced Materials
JF - Advanced Materials
IS - 18
M1 - 2109714
ER -