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White-light and Fluorescence Microscopy

WITec imaging microscopes are equipped with a Köhler-illumination setup with optimized optical components for generating white-light images of outstanding quality. We offer different options including bright- and dark-field imaging and differential interference contrast (DIC). White-light microscopy is possible in reflection and transmission modes and can feature polarization setups. 

Optionally, WITec systems can integrate fluorescence microscopy for correlative approaches.


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Features


White-light Microscopy Options

WITec imaging microscopes can integrate bright-field options in reflection or transmission mode, in addition to other techniques including differential interference contrast (DIC) and dark-field imaging.

Focus Stacking and Image Stitching

All light microscopy techniques in WITec microscopes feature software-controlled focus stacking and image stitching. With focus stacking, sharp images of samples of varying height can be quickly generated from a stack of individual images. Automated image stitching combines a series of individual measurements into a large-area image at the highest resolution.

Polarized White-light Microscopy 

White-light microscopy in WITec microscopes can optionally be upgraded with polarization modules, ideally suited for applications in geology, biology, chemistry and material science. The independent control of the polarizer (excitation path) and analyzer (detection path) facilitate different polarization illumination setups in parallel and perpendicular orientations.

Polymer blend of PS and PMMA in differential interference contrast (DIC) microscopy
Polymer blend of PS and PMMA in white light microscopy
Bright-field (left) and DIC image (right) of a polymer blend of PS and PMMA. DIC Image acquired using an Epiplan-Neofluar DIC 100x/0.9 NA objective.
Image stacking
Particle imaged using dark-field microscopy without (left) and with focus stacking (right).

Discover WITec's outstanding light microscopy performance

The white-light microscopy capabilities of WITec systems convince with their exceptional performance. In this example, small inclusions were easily found in a diamond, even though they were located 20 – 50 µm beneath the surface. Confocal Raman imaging at the same position then revealed the inclusions' composition.

Diamond inclusion overview
Diamond inclusion inset
Diamond inclusion Raman image
Left: Transmission image (5x/0.13 NA objective) of a diamond with inclusions. Middle: Magnification of a small inclusion in the diamond (100x/0.9 NA objective). Right: Raman image of the inclusion in the outlined area. Red: Diamond; Blue: Gel; Green: Pyrope.

Fluorescence Microscopy

Combine Raman microscopy and fluorescence imaging in one instrument. The optional fluorescence setup for WITec microscopes uses laser excitation and features a highly sensitive monochromatic camera for detection. Matching emission filters are available for a large number of compatible wavelength combinations.

Fluorescence Image - Cell Nuclei
Raman Image - Cells
Composite Image - Cells
Correlative Raman and fluorescence imaging of cells. Left: Cellular nuclei stained with the fluorescence marker DAPI. Middle: Endoplasmic reticulum (green) and nucleoli (orange) identified with Raman. Right: Overlay image.

Application Examples

Biotite mineral imaged using polarization-resolved white-light microscopy
Analysis of biotite mineral thin-section with different polarization-resolved white-light illumination modes. Unpolarized reflection (A), transmission mode (B), parallel-polarized (C) and cross-polarized transmission image (D).
Image stitching
Stitched large-area bright-field (left) and dark-field (right) images of particles from a ParticleScout measurement.
Feldspar matrix with actinolite fibers in transmission white light microscopy
Detection of actinolite fibers in a feldspar matrix with transmission microscopy. Image courtesy of Didier Lahondère and Guillaume Wille, French Geological Survey, Orléans (BRGM).

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