How To Make Colour With Holes
Scientists are being inspired by nature to design the next generation of security devices. Arrays of nanoscale holes create beautiful reflected colours that are almost impossible to forge....
==========
I want to show you how to color a transparent piece of plastic without adding anything toit, no dyes, paint, nothing except holes. But first we have to talk about light. Mostpeople know that it is a form of electromagnetic radiation. But have you ever stopped to thinkabout how strange that is? I mean, light is a combination of electric and magnetic fields.Electric fields like the ones that make these balloons repel and magnetic fields like theones that make these magnets attract. But how can you strip off the electric fieldfrom around charge and the magnetic field from around a magnet and combine those fieldstogether so that they can propagate out through space at the speed of light? Well, the keyis the electric and magnetic fields need to be continuously changing and th...
==========
I want to show you how to color a transparent piece of plastic without adding anything toit, no dyes, paint, nothing except holes. But first we have to talk about light. Mostpeople know that it is a form of electromagnetic radiation. But have you ever stopped to thinkabout how strange that is? I mean, light is a combination of electric and magnetic fields.Electric fields like the ones that make these balloons repel and magnetic fields like theones that make these magnets attract. But how can you strip off the electric fieldfrom around charge and the magnetic field from around a magnet and combine those fieldstogether so that they can propagate out through space at the speed of light? Well, the keyis the electric and magnetic fields need to be continuously changing and th...
