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Differential Interference Contrast (DIC) microscopy is a method used to enhance the contrast of transmitted light images by using polarization of light. By the introduction of two Nomarski prisms (one above and one below your sample), light is sheered into two discrete polarizations which interfere with one-another at the sample plane.

Polarizationmicroscopy

Normal white light is unpolarized, however optical elements can filter only one specific polarization as per the image below.

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Confocalmicroscopy

Polarized light microscopy is a contrast enhancing technique that improves resultant images where the sample being imaged has birefringent properties. This technique is often used for materials science, however can be very useful for some biological applications.

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Darkfield microscopy

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A cut-away of the light path of a phase contrast upright microscope. The condenser annulus is visible below the condenser which only allows through one phase of light. Above the sample plane the phase plate (or sometimes called phase ring) blocks one specific phase of light, and lets through any light that has been refracted by the sample.

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Brightfield microscopy is one of the most basic light microscopy techniques whereby the sample is illuminated by white light that is transmitted through the sample onto the detector. There are different methods available to increase contrast in brightfield images (phase contrast, DIC, Polarized Light and Darkfield) which are available on different systems.

Lightfield microscopy

As light passes through the sample where small changes in refractive index occur (eg the presence of cellular membranes) the two polarizations will be affected, and hence the interference will change, altering the resultant image.

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Differential interference contrastmicroscopy

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Type of microscope

It is the distance from the lens to the film, when focused on a subject at infinity. In other words, focal length equals image distance for a far subject.

The focal length number tells us how much of the scene is captured in the picture. The lower the number the wider the view, and the more we can see.

Example of a darkfield light path below the sample plane, where only stray rays of light are collected into the rear of the objective.

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Phase contrast microscopy is a technique used to increase contrast within transparent samples such as cells or thin tissue sections. The technique works by using an annulus at the condenser to only allow certain phases of light though the condenser and onto the sample. At the rear of the objective there is a matching (but inverted) phase plate, which blocks light let through the condenser annulus. Light that is diffracted by the sample will no longer be in the same phase and will bypass the phase ring and be directed onto the camera or imaging device.

Phase contrastmicroscopy

Brightfield imaging or transmitted light microscopy usually has very low contrast between signal and background, therefore there are a number of techniques available which will be explained below.

DIC LightPath in an upright microscope. Here the two Nomarski prisms are visible above and below the sample stage. Note in this arrangement there is also a fixed polarizer and attached Quarter wavelength plate which allows you to rotate 90 degrees in the imaging plane.

In a polarized light microscope a polarizing filter is added immediately after the brightfield light source and an additional polarizing filter is fitted above the sample before the eyepieces or image capture device. The polarizer below the sample is usually adjustable by rotation to select for different polarization angles. See the light path diagram below.

Fluorescence microscope

Reflection When a wave hits a smooth object that is larger than the wave itself, depending on the media, the wave may bounce in another direction.

In the images below, the fibers do not appear to have a lot of contrast (a), however when illuminated by darkfield microscopy (b) much more contrast is apparent. In some circumstances you have too much contrast (c) when using conventional brightfield, this can also be improved when using darkfield (d) where less contrast is achieved.

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Ensuring the condenser is in the right position is vital for all of these techniques. To perform the correct alignment on the condenser requires a technique called Kohler Illumination, which examples and further explanations can be found here.

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Light path of a polarized light microscope. Note the polarizing filter below the sample and the analyser above the sample which allow discrete polarizations through.

Darkfield microscopy is a technique to increase contrast in your image when the refractive index of your sample very closely matches the refractive index of your imaging media. The technique works by blocking the light that comes directly onto the sample, and instead relies solely on stray rays of light to illuminate the sample from the image border.