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Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting
- 超快科学（英文） 2023年3卷第3期
- Affiliations：
a Centre for Translational Atomaterials, School of Science, Swinburne University of Technology, John Street,Hawthorn, VIC 3122, Australia. b School of Science, RMIT University, 124 La Trobe Street, Melbourne,Victoria, 3000, Australia. c The Australian Research Council (ARC) Industrial Transformation Training Centre in Surface Engineering for Advanced Materials (SEAM), RMIT University, 124 La Trobe Street,Victoria,Melbourne,Australia,3000
- Author bio：
- Funds：
DOI：10.34133/ultrafastscience.0018
中图分类号：纸质出版日期：2023，
- Accepted：
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Guiyuan Cao, Han Lin, Baohua Jia. 2023: Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting. 超快科学, 3(3).
Guiyuan Cao, Han Lin, Baohua Jia. 2023: Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting. Ultrafast Science, 3(3).
Guiyuan Cao, Han Lin, Baohua Jia. 2023: Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting. 超快科学, 3(3). DOI： 10.34133/ultrafastscience.0018
Guiyuan Cao, Han Lin, Baohua Jia. 2023: Broadband Diffractive Graphene Orbital Angular Momentum Metalens by Laser Nanoprinting. Ultrafast Science, 3(3). DOI： 10.34133/ultrafastscience.0018
摘要
Optical beams carrying orbital angular momentum (OAM) play an important role in micro-/nanoparticle manipulation and information multiplexing in optical communications.Conventional OAM generation setups require bulky optical elements and are unsuitable for on-chip integration. OAM generators based on metasurfaces can achieve ultracompact designs. However
they generally have limited working bandwidth and require complex designs and multistep time-consuming fabrication processes.In comparison
graphene metalenses based on the diffraction principle have simple designs and can be fabricated by laser nanoprinting in a single step. Here
we demonstrate that a single ultrathin (200 nm) graphene OAM metalens can integrate OAM generation and high-resolution focusing functions in a broad bandwidth
covering the entire visible wavelength region. Broadband graphene OAM metalenses with flexibly controlled topological charges are analytically designed using the detour phase method considering the dispersionless feature of the graphene material and fabricated using ultrafast laser nanoprinting. The experimental results agree well with the theoretical predictions
which demonstrate the accuracy of the design method. The broadband graphene OAM metalenses can find broad applications in miniaturized and integrated photonic devices enabled by OAM beams.
Abstract
Optical beams carrying orbital angular momentum (OAM) play an important role in micro-/nanoparticle manipulation and information multiplexing in optical communications.Conventional OAM generation setups require bulky optical elements and are unsuitable for on-chip integration. OAM generators based on metasurfaces can achieve ultracompact designs. However
they generally have limited working bandwidth and require complex designs and multistep time-consuming fabrication processes.In comparison
graphene metalenses based on the diffraction principle have simple designs and can be fabricated by laser nanoprinting in a single step. Here
we demonstrate that a single ultrathin (200 nm) graphene OAM metalens can integrate OAM generation and high-resolution focusing functions in a broad bandwidth
covering the entire visible wavelength region. Broadband graphene OAM metalenses with flexibly controlled topological charges are analytically designed using the detour phase method considering the dispersionless feature of the graphene material and fabricated using ultrafast laser nanoprinting. The experimental results agree well with the theoretical predictions
which demonstrate the accuracy of the design method. The broadband graphene OAM metalenses can find broad applications in miniaturized and integrated photonic devices enabled by OAM beams.
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references
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