Micro lenses

Microlensses are usually placed on top of the color filter array on certain sensors of digital cameras, their principal role being to overcome the limitation of a low fill factor. Microlenses are also used in order to funnel the photons of a larger area into a smaller area of light sensitive photodiode.

Microlenses are small lenses with diameters less than a millimeter or as small as 10 micrometers. Although there are so small, they can give a good optical quality. But there are situations when unwanted effects arise, due to optical diffraction at the small features.  In designing a microlens we have to take into consideration the substrate supports, which is thicker than the lens.  Usually a microlens is made of a single element with one plane surface and one spherical convex surface to refract the light. But there are more sophisticated lenses which are made of aspherical surfaces, or, of several layers of optical material, in order to achieve their design performance.


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