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Updated: Jan 22, 2026

Phase Contrast and Differential Interference Contrast DIC Microscopy

Phase Contrast and Differential Interference Contrast DIC Microscopy

Published on: August 6, 2008

Molecular contrast on phase-contrast microscope.

Keiichiro Toda¹, Miu Tamamitsu¹, Yu Nagashima²

¹Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.

Scientific Reports

|July 19, 2019

Summary

This summary is machine-generated.

Researchers developed a simple add-on unit for standard microscopes to provide molecular contrast imaging. This photothermal-based technology enables label-free molecular visualization, enhancing existing microscopy capabilities.

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Area of Science:

Optics and Photonics
Biomedical Imaging
Materials Science

Background:

Standard optical microscopes are crucial for morphological imaging but lack molecular contrast capabilities.
Label-free imaging is desirable for biological and material samples to avoid sample preparation artifacts.
Existing microscopy techniques often require specific stains or labels to visualize molecular information.

Purpose of the Study:

To develop a simple, add-on optical unit for standard microscopes to achieve label-free molecular contrast imaging.
To integrate photothermal effect principles for molecular vibrational spectroscopy within a microscopy platform.
To enhance the diagnostic and analytical power of conventional microscopy by adding molecular information.

Main Methods:

Development of an add-on optical unit featuring an amplitude-modulated mid-infrared semiconductor laser.
Integration of the molecular-contrast unit with a standard phase-contrast microscope.
Demonstration of high-speed, label-free molecular-contrast phase-contrast imaging and molecular-vibrational spectroscopic imaging.

Main Results:

Successful implementation of a molecular-contrast unit that adds molecular information to conventional microscopic images.
High-speed, label-free imaging of a silica-polystyrene microbeads mixture.
Label-free molecular-vibrational spectroscopic imaging of HeLa cells was achieved.

Conclusions:

The developed molecular-contrast unit effectively provides additional molecular contrast to standard microscopes.
This technology offers a convenient and accessible method for label-free molecular imaging and spectroscopy.
The add-on unit has the potential to significantly enhance the capabilities of existing microscopy systems across various scientific fields.