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Updated: May 6, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Waveguide Microactuators Self-Rolled Around an Optical Fiber Taper.

Yang Zong1,2, Minjie Xi1,2, Yunqi Wang1,2

  • 1Department of Materials Science, Fudan University, Shanghai, 200438, China.

Advanced Materials (Deerfield Beach, Fla.)
|February 16, 2025
PubMed
Summary

This study introduces novel hydrogel/gold microactuators that rapidly self-roll around optical fibers for precise micro-object manipulation. These photoactuators enable fast, non-contact capture and movement of cells and microorganisms.

Keywords:
micromanipulationmicroorganismsnon‐reciprocal motionself‐rolled‐upwaveguide microactuator

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Area of Science:

  • Biomedical Engineering
  • Microrobotics
  • Materials Science

Background:

  • Precise manipulation of microscale objects like cells is crucial for biomedical research and microrobotics.
  • Optical fiber photoactuators offer advantages for confined spaces but face challenges with size mismatch and slow response times.
  • Existing methods struggle to handle fast-moving micro-objects effectively.

Purpose of the Study:

  • To design and demonstrate a novel microactuator system for rapid and precise manipulation of microscale objects.
  • To overcome the limitations of existing optical fiber-based microactuators, particularly concerning response speed and size integration.
  • To provide a versatile platform for advanced biomedical applications requiring micro-manipulation.

Main Methods:

  • Fabrication of microactuators using hydrogel/gold bilayer heterostructures.
  • Integration of microactuators with tapered optical fibers via a self-rolling mechanism.
  • Utilizing light-induced hydrogel phase transitions for rapid actuation.
  • Testing capture and manipulation of motile microorganisms (Chlamydomonas, Paramecium) and yeast cells.

Main Results:

  • Achieved microactuators with low bending stiffness and large bending angles (>800°) within 0.55 seconds.
  • Demonstrated successful capture of rapidly swimming Chlamydomonas and Paramecium.
  • Showcased programmable non-reciprocal motion for non-contact manipulation of yeast cells.
  • Enabled the use of micrometer-thin hydrogel layers for enhanced responsiveness.

Conclusions:

  • The developed hydrogel/Au bilayer microactuators offer an effective solution for fast, precise micro-manipulation.
  • This self-rolling mechanism around optical fibers overcomes previous integration and speed limitations.
  • The platform shows significant potential for diverse biomedical applications and advanced microrobotics.