SONG Bo-wen,LI Jia-wen.Rapid fabrication of hollow double helix microrobot using femtosecond laser dynamic holograpic method[J].Optics and Precision Engineering,2021,29(09):2101-2107.
SONG Bo-wen,LI Jia-wen.Rapid fabrication of hollow double helix microrobot using femtosecond laser dynamic holograpic method[J].Optics and Precision Engineering,2021,29(09):2101-2107. DOI: 10.37188/OPE.20212909.2101.
Rapid fabrication of hollow double helix microrobot using femtosecond laser dynamic holograpic method
To realize rapid mass fabrication of microrobots, in this study, a femtosecond Bessel beam superposition interference method is proposed to generate a circular light with side lobes. Combined with dynamic holographic processing, this method enables hollow helix microrobots to be efficiently fabricated. First, Bessel holograms generated according to the Bessel transmission function are superposed, and the generated light field is simulated and experimentally measured. Next, ring structures with different numbers of side lobes (2-4) are fabricated using the superimposed holograms, and the effects of two parameters on the width of the side lobe and diameter of the ring are analyzed. Subsequently, hollow double helix microrobots with widths of 25 µm and lengths of 100 µm are rapidly fabricated by introducing the dynamic holographic processing method. Finally, the microrobots are driven by a rotating magnetic field in a microfluidic environment. Experimental results indicate that only 6 s are required to process a microrobot and that the microrobots advance 400 µm in a straight line in 7 s under a rotating magnetic field. This method provides a promising means of mass manufacturing helix microrobots and has immense application value in fields such as noninvasive surgery and drug delivery.
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