Diffraction grating

Diffraction grating

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Credit: Scimat/SCIENCE PHOTO LIBRARY

Caption: Transmission electron micrograph (TEM) of a germanium-and-carbon replica of diffraction grating on a 200-mesh, 3.05 mm grid. The diffraction grating itself consists of a glass plate or a mirror with a large number of equidistant parallel lines or grooves on its surface; it is used to disperse a beam of light (or other electromagnetic radiation) into wavelengths to produce a spectrum. This has a spacing of 462.9nm, 2160 lines per millimetre, ideal for calibrating electron-optical magnification up to the x80,000-100,000 range. The ridges of the grating are sharp (light in colour, as if lighted from the left upper corner) and the valleys are dark and contain some very fine debris. Enhanced TEM. Image width: 5.5 micrometers. Magnification: 18,200x if the image is printed 10 cm wide.

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Keywords: carbon replica, colour, constructive interference, destructive interference, diffraction, dispersal, disperse, dispersive, frequency, germanium replica, grating, light, micrograph, micrography, microscopy, optical, optical device, optics, physical, physics, shadowcast, shadowcast carbon replica, shadowcast tem, tem, transmission electron micrograph, wave, wave interference, wave nature, wavelength

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