When it comes to metal, you can have any colour as long as its silver. That’s because the sea of electrons within most metals absorbs and emits light over the entire optical range. Rather than silver, metals are actually colourless. There are exceptions, of course. Gold absorbs blue light and this produces its characteristic yellow colour. And copper absorbs blue and green light making it look a reddy orange. Other colours are hard to come by without coating the metal or carving a diffraction grating onto its surface to produce a characteristic interference pattern, like those from a compact disc. But now there’s another way thanks to some interesting work by Jianfa Zhang at the University of Southampton and a few pals. Their idea is to carve a different type of repeating pattern on to the surface of a metal.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Samsung & Batteries
Wearables — Vintage cosplay resources
Electronics — Hummm… 60Hz noise in your amplifier driving you nuts?
Biohacking — Hykso: Punch Tracking Sensors
No comments yet.
Sorry, the comment form is closed at this time.