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An optimal optical filter set of the above three individual filters blocks unwanted excitation light (including in the UV and IR) as well as unwanted emitted light (including autofluorescence) to ensure high signal and low background.

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The excitation filter is usually a bandpass filter designed to pass only those light source wavelengths that are to be absorbed by the fluorophore, thereby minimizing excitation of other sources of fluorescence, and especially blocking excitation light in the fluorescence emission band.

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The emitter is usually a bandpass filter that passes only the wavelengths emitted by the fluorophore and blocks all undesired light outside this band – especially the excitation light.

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For a more in-depth overview of considerations relevant to the design of a fluorescence multiplexing system, click here.

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Our flagship BrightLine® filter sets follow fluorophore usage trends, light source innovation, and detector enhancements. These sets balance filter set needs and cost and offer set performance over a wide range of fluorescent probes and microscopy applications, based on our years of experience designing optical filters.

For the glass materials list, click here.

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The dichroic is an edge filter (usually passing longer wavelength light and reflecting shorter wavelength light) used at an oblique angle of incidence (typically 45°) to efficiently redirect light in the excitation band towards the sample and transmit light in the emission band towards the detector.

To summarize, filter sets strike a balance between high brightness and high contrast, typically by using narrower or wider passbands in combination with center wavelength placement.

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The main difference between an excitation filter vs emission filter? An excitation filter lets in light to excite a molecule, while an emission filter transmits the light the molecule emits.

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Fluorescence occurs when a molecule absorbs light at wavelengths within its absorption band, and then emits light at longer wavelengths within its emission band. For example, brightly fluorescent molecules (called fluorophores) can be attached to biologically significant molecules in e.g. cell membranes, in the brain, or even on subunits of DNA, whose structures become visible in a fluorescence microscope that allows us to track the way cells function in health and disease. Fluorescence is widely used in biology, biotechnology, and medicine, due to its extraordinary sensitivity, high specificity, and simplicity of usage.

The filter set described above can only be used for one fluorophore, since it has only one passband each for excitation and for emission. If for example two fluorophores are used, the set will need to have two passbands each for exciter, dichroic, and emitter. These are called multiband sets; for more information, review our White Paper.

Fluorescence microscopy, and most instruments that use fluorescence, including fluorescence microscopes, rely on optical filters. A typical microscope has three basic filters: an excitation filter (or exciter), a dichroic beamsplitter (or dichroic mirror), and an emission filter (or emitter). These three filters form what is referred to as a “filter set” and are often housed in a special assembly called a “filter cube” that can be quickly mounted in a microscope.

The team at IDEX Health & Science has specific experience and expertise in design of optical filter sets and optimizes each set to make sure the filters work well together. Semrock fluorescence optical filters and fluorescence filter sets therefore offer a number of critical advantages to users and developers of fluorescence-based optical platforms/p>

Semrock employs all these advantages in the industry-leading Avant™ filter sets that increase emission signal from short Stokes’ shift (low “Gap”) fluorophores by collecting the emission signal over the peak emission ranges and blocking excitation crosstalk. Learn more.

Fluorescence guided surgery (FGS) uses optical filters to assist surgeons in visualizing organs or structures during surgery. In this example, the patient drank a fluid containing the fluorophore, and the surgeon used a special visualizing system that sent light into the body to excite the fluorophore. In the photo, the green area highlights an anatomically complex location, and the surgeon knows precisely where to operate. Without FGS, this patient’s surgery would be difficult and dangerous.