Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

Xin Chen, Ivan M. Kislyakov (), Tiejun Wang, Yafeng Xie, Yan Wang, Long Zhang and Jun Wang ()
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Xin Chen: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Ivan M. Kislyakov: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Tiejun Wang: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Yafeng Xie: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Yan Wang: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Long Zhang: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences
Jun Wang: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Achieving optically controlled nanomachine engineering can satisfy the touch-free and non-invasive demands of optoelectronics, nanotechnology, and biology. Traditional optical manipulations are mainly based on optical and photophoresis forces, and they usually drive particles in gas or liquid environments. However, the development of an optical drive in a non-fluidic environment, such as on a strong van der Waals interface, remains difficult. Herein, we describe an efficient 2D nanosheet actuator directed by an orthogonal femtosecond laser, where 2D VSe2 and TiSe2 nanosheets deposited on sapphire substrates can overcome the interface van der Waals forces (tens and hundreds of megapascals of surface density) and move on the horizontal surfaces. We attribute the observed optical actuation to the momentum generated by the laser-induced asymmetric thermal stress and surface acoustic waves inside the nanosheets. 2D semimetals with high absorption coefficient can enrich the family of materials suitable to implement optically controlled nanomachines on flat surfaces.

Date: 2023
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DOI: 10.1038/s41467-023-37763-8

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