Diffraction grating structures

Sensors Based on Resonances in Diffraction Grating Structures. 81... 

Stamping microcontact printing 50nm-1.5pm Direct development of patterned film Lateral resolution Waveguides, capacitors, diffraction gratings, lab-on-a-chip structures... 

This is a simple example of the synthesis of an image from a diffraction pattern by calculation. The synthesis of an image of a crystal structure from its X-ray diffraction pattern is more complex (because a three-dimensional diffraction grating is involved), but similar in principle, because the X-ray diffraction spots produced by an atomic pattern are absolutely analogous to the diffracted light beams formed by a pattern whose repeat distance is comparable with the wavelength of light. 

Fig. 23 Plausible structure of the holographic diffraction grating, with an alternating arrangement of N and I phases present under the relief structure.

Rigid materials have typically been used to fabricate MEMS and optical components (for example, diffraction gratings, lenses and mirrors). These materials have the advantages of structural rigidity and strength. In certain applications, however, rigid materials may not provide the only solution to structural problem adaptive optics is such an application [67]. Adaptive optics have com-... 

The planes of motifs in a crystal thus act essentially as diffraction gratings (Bueche, 1986). Diffraction of electromagnetic radiation by crystals can occur only when the wavelength of the radiation is of the same order of magnitude as the regular repeat distance between motifs. This is the basis of the usefulness of using X-rays to determine crystal structure. 

The geometric structural information about the crystal can be extracted from the diffraction pattern by geometric analysis. The concept of a crystal as being a diffraction grating for X-radiation and the relationships between the geometry of the diffraction grating and the pattern of... 

---