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Imaging Biological Samples with Optical Microscopy

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: Mar 15, 2026

$Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction$

Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction

Published on: October 25, 2012

Swimming Microrobot Optical Nanoscopy.

Jinxing Li¹, Wenjuan Liu¹, Tianlong Li¹

¹Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States.

|September 10, 2016

Summary

This summary is machine-generated.

Chemically powered microrobots equipped with microsphere lenses enable autonomous, subdiffraction optical scanning for advanced nanoscopy. This breakthrough allows for large-area, nondestructive imaging of delicate biological structures with unprecedented resolution.

Keywords:

Microrobot biological imaging microlens nanoscale propulsion scanning super-resolution

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Area of Science:

Optics and Photonics
Nanotechnology
Biophysics

Background:

Optical imaging resolution is fundamentally limited by diffraction.
Existing subdiffraction imaging techniques require complex nanophotonic devices.
Achieving controlled nanoscale motion in liquids for scanning is challenging due to viscous flow and Brownian motion.

Purpose of the Study:

To introduce a novel method for subdiffraction optical scanning using autonomous microrobots.
To demonstrate the capability of microrobots for nondestructive, large-area imaging of biological samples.
To advance nanoscopy and nanorobotics for imaging and spectroscopy.

Main Methods:

Development of untethered, chemically powered microrobots incorporating high-refractive-index microsphere lenses.
Utilizing local catalytic reactions for microrobot propulsion and autonomous scanning.
Employing magnetic guidance for controlled motion and parallel scanning of samples.

Main Results:

Demonstrated subdiffraction resolution in optical scanning and imaging.
Successful imaging of soft biological samples, including neuron axons, protein microtubulin, and DNA nanotubes.
Achieved autonomous, large-area, parallel, and nondestructive scanning capabilities.

Conclusions:

Swimming microrobot optical nanoscopy offers a practical approach to overcoming diffraction limits in imaging.
Autonomous microrobots provide a versatile platform for advanced nanoscopy and in-situ imaging of biological systems.
Integration with nanorobotics paves the way for ubiquitous nanoscopy and smart nanodevices.