By SILSEF
A diffraction grating is an optical element having the ability to diffract light by a periodic variation of its profile and / or its index (hologram). Diffraction gratings have the property of deflecting angularly a monochromatic beam as well as angularly separating the wavelengths of a polychromatic beam. Diffraction gratings have interesting properties in order to “manipulate” light. It is possible to separate a monochromatic incident beam into several beams or to angularly separate the different wavelengths of a polychromatic source. It is also possible to play on different grating’s parameters such as the period, the material, the depth to obtain the desired diffraction intensity. Diffracting patterns on silicon substrate.
