feit banknotes and passports is just the beglg- lee will be many other practical

Question

feit banknotes and passports is just the beglg- lee will be many other practical applications, from authenti- cating legal documents and stock certificates to preventing counterfeit pharmaceuticals. In fact, the inventors hope to replace holograms in a variety of merchandise, including sports brands, running shoes, and DVD software. Figure 4 This scanning electron perforations in the blue morpho's wings. It is these perforations, and not a pigment, that produce an iridescent effect. ph image shows the tiny Further Reading Fraser University in British Columbia, Landrock remem- raser University in British Columbia, Landrock remeDrexler, E.K. (1996). Engines of creation: The coming era af nanotechnology. London: Fourth Estate. bered the blue morpho butterfly and how it reflected and lohnston, S.F. (2006). Holographic visions: A history of new refracted light. He noticed that thin metal sheets containing tiny perforations created iridescence, just as the wings of the blue morpho butterfly do. The iridescent light from science. Oxford: Oxford University Press. WEB LINK Questions what concepts related to the wave nature of light apply to nanotechnology? Explain one of these concepts and how it applies to the technology 2) Explain how butterfly wings reflect light to produce vivid colours. How does this application of nanotechnology demonstrate the link between science and technology? WEB LINK 10.7 Physics Journal: Light Nanotechnology and Counterfeit Prevention

Explanation / Answer

The secret aand physics behind butterflies wing colour is known as "PHOTONIC CRYSTALS".

Photonic crystals are precise arrangements of geometrical patterns at microscope scaleOn butterfly wings, these patterns might be bumps, holes, ridges, hexagonal arrays or other shapes, often in 3-D arrangements. The shapes are spaced very close to the wavelengths of light in ways that intensify the reflected light of certain colors and absorb others. The control is so effective that the colors can be seen from a wide range of angles, even when the butterfly is flapping its wings in flight.

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