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Notch Filter

There are several advantages to using a Notch Filter while doing microscopy and Raman spectroscopy. Particularly, the Notch Filter can improve your imaging's clarity and accuracy while lowering background noise. Additionally, it may be utilized in combination with other filters, such a polarizer.


Optical notch filters

Optical notch filters, also known as band-stop filters, are used in a variety of applications. These filters can be made using electron beam evaporation, ion-assisted deposition, or a combination of the two. They provide good in-band transmission with a low optical loss. Traditionally, notch filters are made by alternately incorporating high refractive index and low refractive index layers. In order to produce good quality notch filters, it is important to ensure that the thicknesses are reasonable and that the film has a smooth surface. This is done by analyzing the surface morphology and measuring the roughness of the film with a field-emission scanning electron microscopy (FE-SEM) instrument and a Linnik microscopic interferometer. Several important features of the RF notch filter are the high in-band transmission, narrow rejection band, and good mechanical stress. These features make it suitable for many life science applications. However, the research challenge is to create a notch filter with high layer quality, reproducibility, and reasonable film stress.

Why choose Hefei Topwave Notch Filter?

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