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Remote Axial Tuning in Microscopy Utilizing Hydrogel-Driven Tunable Liquid Lens.

Aditi Kanhere1, Guangyun Lin1, Hongrui Jiang2

  • 1Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706 USA.

Journal of Microelectromechanical Systems : a Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems
|January 28, 2020
PubMed
Summary

This study introduces a tunable liquid lens for remote microscopy focusing, reducing mechanical complexity and vibration distortion. The new system achieves a wider scanning range and maintains high resolution for clearer biological imaging.

Keywords:
Tunable lensesaxial tuningmicroscopy

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Area of Science:

  • Microscopy
  • Biophotonics
  • Materials Science

Background:

  • Conventional microscopy often suffers from image distortion caused by mechanical stage vibrations during axial scanning.
  • Achieving precise remote axial focusing in microscopy typically requires complex and power-intensive mechanical systems.

Purpose of the Study:

  • To develop and demonstrate a novel remote axial focusing method for microscopy using a tunable-focus liquid lens.
  • To eliminate image distortion caused by sample vibrations and reduce mechanical complexity and power consumption.

Main Methods:

  • Integration of a thermo-responsive hydrogel-based liquid lens with a conventional objective lens for remote axial focusing.
  • Characterization of a customized microscope system, evaluating axial scanning range and lateral resolution.
  • Imaging of *Spodoptera frugiperda* Sf21 insect cells to validate depth scanning and resolution capabilities.

Main Results:

  • Achieved a two-fold increase in the axial scanning range, up to 1700 μm.
  • Maintained a consistent lateral resolution of 2 μm throughout the scanning range.
  • Successfully demonstrated depth scanning ability and verified resolution using live insect cell imaging.

Conclusions:

  • The tunable-focus liquid lens enables effective remote axial focusing in microscopy, overcoming limitations of mechanical scanning.
  • This approach significantly reduces system complexity and power requirements while enhancing imaging performance.
  • The proposed system offers a promising solution for vibration-free, high-resolution microscopy with extended depth imaging capabilities.