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Related Concept Videos

Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...

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Related Experiment Video

Updated: Jun 1, 2026

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies
06:53

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Published on: November 18, 2022

Surface imaging using holographic optical tweezers.

D B Phillips1, J A Grieve, S N Olof

  • 1H H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Clifton, Bristol BS8 1TL, UK.

Nanotechnology
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel holographic optical tweezers technique for imaging delicate samples. The method offers non-damaging, high-resolution surface imaging, particularly for challenging biological specimens.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Nanotechnology

Background:

  • Scanning probe microscopy (SPM) faces challenges with delicate, curved, or scattering samples.
  • Existing techniques like photonic force microscopy can damage sensitive specimens.
  • Need for non-invasive imaging methods in physiological conditions.

Purpose of the Study:

  • To develop a novel imaging technique using holographic optical tweezers and a cigar-shaped probe.
  • To enable non-damaging, high-resolution imaging of delicate and challenging surfaces.
  • To overcome limitations of current SPM and photonic force microscopy.

Main Methods:

  • Utilizing holographic optical tweezers to control a cigar-shaped probe.
  • Raster scanning the probe over the sample surface for image acquisition.
  • Employing closed-loop feedback control with a high-speed CMOS camera for probe positioning.
  • Positioning optical traps away from probe ends to minimize sample illumination and damage.

Main Results:

  • Successfully imaged the interface between polystyrene beads for calibration.
  • Demonstrated imaging of a live soft alga (Pseudopediastrum) surface in physiological conditions with minimal disruption.
  • Achieved resolution comparable to confocal microscopy.
  • Showcased the ability to image highly curved and strongly scattering samples.

Conclusions:

  • The holographic optical tweezers technique provides a less forceful and non-damaging alternative to contact SPM.
  • This method is suitable for imaging delicate biological samples, including live algae, without causing optical damage.
  • Future improvements in probe design and thermal motion control can enhance resolution beyond the diffraction limit.