micro lens

Apr 07, 2018 Written by Raman singh Lens


                              Micro Lens

1 A microlens is a small lens, generally with a diameter less than a millimetre (mm) and often as small as 10 micrometres (µm).

2 The small sizes of the lenses means that a simple design can give good optical quality but sometimes unwanted effects arise due to optical diffraction at the small features.

3 A typical microlens may be a single element with one plane surface and one spherical convex surface to refract the light.

4 Because micro-lenses are so small, the substrate that supports them is usually thicker than the lens and this has to be taken into account in the design

5 More sophisticated lenses may use aspherical surfaces and others may use several layers of optical material to achieve their design performance

6  A different type of microlens has two flat and parallel surfaces and the focusing action is obtained by a variation of refractive index across the lens.

7  These are known as gradient-index (GRIN) lenses. Some micro-lenses achieve their focusing action by both a variation in refractive index and by the surface shape.

8 Macro and micro photography take this concept a step further. Usually, macro and micro refer to the same thing.

9 The difference is simply in the words. “Macro” refers to something large, where “micro” means small.

10 This photography style lets the subject fill all or most of the frame so that you can get an incredible amount of detail. In other words, you’d get a “macro” shot of a “micro” object. And, because it takes up the frame, you can lose the sense of how tiny the subject actually is.