Tilting 'nanocups' double optical frequencies - physicsworld.com
I think this technology could drastically improve our existing range of colors and the power we can get out of some of them.
A new type of structure for converting red light into blue has been unveiled by researchers in the US. Known as frequency doubling or second-harmonic generation (SHG), the conversion involves "nanocups", which are tiny, artificially designed 3D structures [...] researchers believe that the new structures could be adapted to achieve frequency doubling in parts of the electromagnetic spectrum where it is currently not possible.
SHG is a nonlinear optical process whereby two similar photons are converted into a single photon with twice the energy – and therefore twice the frequency or half the wavelength – of the initial photons. The process was first demonstrated in 1961 when researchers focused a ruby laser with a wavelength of 694 nm into a quartz sample and observed that the light that was subsequently emitted had a wavelength of 347 nm.
I think this technology could drastically improve our existing range of colors and the power we can get out of some of them.