Lalaguna Paula L, Souchu Paul, Mackinnon Neel, Crimin Frances, Kumar Rahul, Chaubey Shailendra Kumar, Sarguroh Asma, McWilliam Amy, Ganin Alexey Y, MacLaren Donald A, Franke-Arnold Sonja, Götte Jörg B, Barnett Stephen M, Gadegaard Nikolaj, Kadodwala Malcolm
School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
Faculté des sciences et ingénierie, Université de Toulouse UPS, Toulouse 31400, France.
ACS Nano. 2024 Jul 29;18(31):20401-11. doi: 10.1021/acsnano.4c04506.
Single-layer two-dimensional (2D) nanomaterials exhibit physical and chemical properties which can be dynamically modulated through out-of-plane deformations. Existing methods rely on intricate micromechanical manipulations (., poking, bending, rumpling), hindering their widespread technological implementation. We address this challenge by proposing an all-optical approach that decouples strain engineering from micromechanical complexities. This method leverages the forces generated by chiral light beams carrying orbital angular momentum (OAM). The inherent sense of twist of these beams enables the exertion of controlled torques on 2D monolayer materials, inducing tailored strain. This approach offers a contactless and dynamically tunable alternative to existing methods. As a proof-of-concept, we demonstrate control over the conductivity of graphene transistors using chiral light beams, showcasing the potential of this approach for manipulating properties in future electronic devices. This optical control mechanism holds promise in enabling the reconfiguration of devices through optically patterned strain. It also allows broader utilization of strain engineering in 2D nanomaterials for advanced functionalities in next-generation optoelectronic devices and sensors.
单层二维（2D）纳米材料展现出可通过面外变形进行动态调制的物理和化学性质。现有方法依赖于复杂的微机械操作（如戳、弯曲、弄皱），这阻碍了它们在技术上的广泛应用。我们通过提出一种全光学方法来应对这一挑战，该方法将应变工程与微机械复杂性分离开来。此方法利用携带轨道角动量（OAM）的手性光束产生的力。这些光束固有的扭曲感能够在二维单层材料上施加可控扭矩，从而诱导出定制应变。这种方法为现有方法提供了一种非接触且可动态调谐的替代方案。作为概念验证，我们展示了使用手性光束对石墨烯晶体管的电导率进行控制，展现了这种方法在未来电子器件中操纵性能的潜力。这种光学控制机制有望通过光学图案化应变实现器件的重新配置。它还能使应变工程在二维纳米材料中得到更广泛应用，以实现下一代光电器件和传感器的先进功能。
