Abstract
In this article we analyze the production of localized colour centres on the surface of alkali halide crystals and films produced by electron beam radiations in the 10–30 keV range. It was found that the colour centre production is restricted to electron penetration (3–10 μm depending on the material and electron energy) with a very intense local optical density (above 10 4 cm −1). As the refractive index variation calculated using the Kramers-Krõnig relations from the observed absorption bands should be enough for light confinement (10 −3–10 −2), electron beam generated colour centres should allow the production of light wave guides for several applications. Optical absorption bands can be created in ionic crystals anywhere from the ultraviolet to the infrared, preserving transparent regions of the spectrum. With an appropriate computer aided design (CAD) program and a microcomputer interface to the adapted micropositioning mechanical devices and shutter, it was possible to control an electron microprobe sample holder in order to draw precise patterns and have various controlled exposure times.
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