Mind you, its an artificially created lab-effect ..
Quote:
In a paper published today in the Nature Photonics journal, Swinburne researchers Dr Baohua Jia, Dr Xiangping Li and Professor Min Gu and their collaborators from Shanghai, have demonstrated the reversal of this effect, which does not occur naturally. That is, when an object and a light wave detector moved closer together, they were able to decrease the light frequency from blue wavelengths to red ones, and vice versa.
..
“This is the first time in the world that the inverse Doppler Effect has been demonstrated in the optical region,” Professor Min Gu, Director of Swinburne’s Centre for Micro-Photonics said.
Maybe I can use this to twart those pesky speed radars !!
Quote:
“In our super prism the dispersion of light was twice the magnitude of a standard Newton Prism. This large angle makes the prism’s refractive index – a property that determines how fast light travels through it – change to negative,” Professor Gu said.
… mount one on the front of the car .. and presto … there ya go ..
