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December 1, 2006

Atomic Array of Nanodots

A laser-focused atomic deposition of "nanodots."

In this form of nanofabrication, a laser propagates across a surface, concentrating atoms into its nodes as they deposit. Here, a two-dimensional standing wave creates an array of dots on the surface, spaced at exactly half the laser wavelength. The image is taken with an atomic force microscope of an array of chromium features on a silicon surface. For this sample, the dots are spaced at 212.78 nanometers and have a height and width of 13 nanometers and 80 nanometers, respectively. (Date of Image: 1995)

Credit: NIST Electron Physics Group

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