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Laser-driven optothermal microactuator operated in water.

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    Applied Optics
    |April 1, 2020
    PubMed
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    This study demonstrates a laser-driven optothermal microactuator (OTMA) functioning underwater. The microactuator shows controllable expansion and contraction in response to laser pulses, paving the way for new underwater micro-devices.

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    Area of Science:

    • Optothermal actuation
    • Micro-electromechanical systems (MEMS)
    • Underwater microdevices

    Background:

    • Optothermal microactuators (OTMAs) offer potential for microscale manipulation.
    • Operating OTMAs in aqueous environments presents unique challenges due to fluid dynamics and thermal dissipation.

    Purpose of the Study:

    • To investigate the feasibility and characteristics of a laser-driven OTMA operating directly in water.
    • To develop and validate a theoretical model for optothermal temperature rise and expansion in water.
    • To explore potential applications in underwater micro-robotics and microfluidics.

    Main Methods:

    • Theoretical modeling of optothermal temperature rise and expansion.
    • Computational simulations of a 1000 µm long OTMA in water.
    • Experimental actuation of a microfabricated OTMA using a 650 nm laser beam.

    Main Results:

    • The OTMA demonstrated expansion and contraction in response to laser pulses in water.
    • Deflection amplitude showed a linear increase with laser power.
    • Deflection amplitudes of 3.9 µm and 3.2 µm were achieved at 9.9 mW laser power and frequencies of 0.9 Hz and 25.6 Hz, respectively.
    • Experimental results closely matched the theoretical model when water damping was considered.

    Conclusions:

    • Laser-driven OTMAs are viable for underwater operation.
    • The developed theoretical model accurately predicts OTMA behavior in water.
    • This technology supports the development of underwater micro-electromechanical systems (MEMS) and micro-optoelectromechanical systems (MOEMS), including micromotors and micro-pumps.