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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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Near-field optical microscope image formation: a theoretical and experimental study.

A V Zvyagin, J D White, M Ohtsu

|July 1, 1997

Summary

This study quantitatively compares theory and experiment for a near-field optical microscope imaging a 30-nm dielectric sample. The results show good agreement, accurately predicting image inversion and edge effects.

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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope

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Area of Science:

Optics
Materials Science
Microscopy

Background:

Near-field optical microscopy offers high-resolution imaging capabilities.
Accurate theoretical models are crucial for interpreting experimental results in near-field microscopy.

Purpose of the Study:

To quantitatively compare experimental results with theoretical predictions for a collection-mode near-field optical microscope.
To validate a classical macroscopic nonglobal model for near-field imaging.

Main Methods:

Imaging a 30-nm cylindrical dielectric sample using a collection-mode near-field optical microscope.
Performing theoretical calculations using a classical macroscopic nonglobal model based on the excitation theorem.
Comparing experimental images with theoretical predictions.

Main Results:

Good agreement was achieved between experimental images and theoretical calculations.
The model correctly predicted key image features, including image inversion, edge enhancement, and edge asymmetry.

Conclusions:

The classical macroscopic nonglobal model provides an accurate theoretical framework for collection-mode near-field optical microscopy.
The validated model can aid in the interpretation and prediction of near-field microscope images.