KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Nanoscale and microscale barcodes, now being used to label a variety of manufactured goods including electronics, paints and explosives. The illustration depicts fluorescent droplets containing multiple fluorescent dyes whose specific ratio defines the code, reflective striped metallic barcodes, silicon wafers encoded by holes, and metallic nanowires encoded by variations in width.
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