中国物理B ›› 2026, Vol. 35 ›› Issue (3): 34301-034301.doi: 10.1088/1674-1056/adf9fd

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Photoacoustic tweezers generated by multiple superposed laser pulses in air

Guo-Dong Tong(佟国栋)1,2,5, Li-Yan Xu(许立言)1,2,5, Wen-Qi Wang(王雯琦)5, Jin-Ping He(何晋平)1,2,3,4,†, and Jun Xia(夏军)5,‡   

  1. 1 Laboratory of Solar and Space Instruments, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 211135, China;
    2 Key Laboratory of Astronomical Optics & Technology CAS, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 211135, China;
    3 Chinese Academy of Sciences Nanjing Branch, Nanjing 211135, China;
    4 University of Chinese Academy of Sciences, Beijing 100049, China;
    5 Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;
  • 收稿日期:2025-06-11 修回日期:2025-07-30 接受日期:2025-08-11 发布日期:2026-02-11
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (Grant No. 2024YFA1612002), the National Natural Science Foundation of China (Grant Nos. 12503094, 11973009, and 11933005), the Jiangsu Provincial Key Research and Development Program (Grant No. BE2023080), the fund from Chinese Academy of Sciences (Grant No. KGFZD-145-23-04-03), China Postdoctoral Science Found (Grant No. 2025M773196), and CAS Young Entrepreneurship Program of Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences (Grant No. E5Q2500005).

Photoacoustic tweezers generated by multiple superposed laser pulses in air

Guo-Dong Tong(佟国栋)1,2,5, Li-Yan Xu(许立言)1,2,5, Wen-Qi Wang(王雯琦)5, Jin-Ping He(何晋平)1,2,3,4,†, and Jun Xia(夏军)5,‡   

  1. 1 Laboratory of Solar and Space Instruments, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 211135, China;
    2 Key Laboratory of Astronomical Optics & Technology CAS, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 211135, China;
    3 Chinese Academy of Sciences Nanjing Branch, Nanjing 211135, China;
    4 University of Chinese Academy of Sciences, Beijing 100049, China;
    5 Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;
  • Received:2025-06-11 Revised:2025-07-30 Accepted:2025-08-11 Published:2026-02-11
  • Contact: Jin-Ping He, Jun Xia E-mail:jphe@niaot.ac.cn;xiajun@seu.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (Grant No. 2024YFA1612002), the National Natural Science Foundation of China (Grant Nos. 12503094, 11973009, and 11933005), the Jiangsu Provincial Key Research and Development Program (Grant No. BE2023080), the fund from Chinese Academy of Sciences (Grant No. KGFZD-145-23-04-03), China Postdoctoral Science Found (Grant No. 2025M773196), and CAS Young Entrepreneurship Program of Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences (Grant No. E5Q2500005).

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摘要： We propose a novel method for generating photoacoustic tweezers via multi-ultrasonic resonance in air. In this study, a focused ultrashort laser pulse with a 50 ns pulse width is used to generate ultrasonic resonance by transferring thermal energy to atmospheric H$_2$O in air. Traveling photoacoustic tweezers are generated by modulating the superposition of multiple ultrasonic waves. Through numerical simulations, we obtained the acoustic pressure and temperature fields of the photoacoustic waves. Experimentally, 10 μm microspherical polystyrene particles were placed messily in a 200 μm wide square microfluidic tube. The resulting shapes of the microparticles after manipulation by the photoacoustic tweezers proved that our experimental results align well with theoretical predictions. We demonstrate that the interaction of laser pulses with water vapor can generate both acoustic waves and photoacoustic tweezers.

关键词: acoustic tweezers, laser field modulation, photoacoustic, photoacoustic tweezers, superposition

Abstract: We propose a novel method for generating photoacoustic tweezers via multi-ultrasonic resonance in air. In this study, a focused ultrashort laser pulse with a 50 ns pulse width is used to generate ultrasonic resonance by transferring thermal energy to atmospheric H$_2$O in air. Traveling photoacoustic tweezers are generated by modulating the superposition of multiple ultrasonic waves. Through numerical simulations, we obtained the acoustic pressure and temperature fields of the photoacoustic waves. Experimentally, 10 μm microspherical polystyrene particles were placed messily in a 200 μm wide square microfluidic tube. The resulting shapes of the microparticles after manipulation by the photoacoustic tweezers proved that our experimental results align well with theoretical predictions. We demonstrate that the interaction of laser pulses with water vapor can generate both acoustic waves and photoacoustic tweezers.

Key words: acoustic tweezers, laser field modulation, photoacoustic, photoacoustic tweezers, superposition

中图分类号:  (Ultrasonics, quantum acoustics, and physical effects of sound)

  • 43.35.+d
52.35.Tc (Shock waves and discontinuities) 52.38.-r (Laser-plasma interactions) 51.40.+p (Acoustical properties) 52.35.-g (Waves, oscillations, and instabilities in plasmas and intense beams)