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Updated: May 4, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
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Light-driven soft microrobots based on hydrogels and LCEs: development and prospects.

Yingnan Gao1, Xiaowen Wang1, Yibao Chen1

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Light-driven microrobots offer precise control for tasks, overcoming limitations of magnetic and acoustic methods. This review focuses on soft microrobots, detailing their driving mechanisms and future potential.

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Area of Science:

  • Microrobotics and Nanotechnology
  • Optics and Photonics
  • Materials Science

Background:

  • Microrobots are crucial for tasks requiring precision, but traditional magnetic and acoustic driving methods face significant limitations, especially for micro-scale robots.
  • Existing driving techniques like magnetic and acoustic methods struggle with precise control at the micron scale and often require specialized, expensive equipment.
  • Light offers a promising alternative energy source for microrobot actuation due to its renewability, high energy transmission capabilities, and the maturity of optical technologies.

Purpose of the Study:

  • To review the driving materials, mechanisms, and applications of light-driven soft microrobots.
  • To discuss the advantages and limitations of current light-driven soft microrobot technologies.
  • To provide insights into the future prospects and challenges in the field of light-driven soft microrobots.

Main Methods:

  • Review of existing literature on light-driven microrobots, focusing on soft microrobot designs.
  • Analysis of driving materials and mechanisms, including light energy conversion principles.
  • Examination of application scenarios and technological advancements in beam modulation and optical microscopy.

Main Results:

  • Light-driven microrobots exhibit programmable, wireless, high-resolution, and accurate spatio-temporal control, surpassing limitations of other methods.
  • Light-driven robots are categorized into soft microrobots, photochemical microrobots, and 3D printed hard polymer microrobots.
  • The review specifically details the driving materials, mechanisms, and applications of light-driven soft microrobots.

Conclusions:

  • Light-driven soft microrobots present a viable and advanced solution for precise micromanipulation and task execution.
  • Despite advantages, challenges remain in the field, necessitating further research and development for optimal performance and broader application.
  • Future research should focus on addressing current limitations and exploring innovative solutions for light-driven soft microrobots.