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Scientists have for the first time demonstrated a reversal of the optical Doppler effect, an advance that could lead to the development of 'invisibility cloak' technology.
The Doppler effect describes the change in frequency of waves whenever there is a relative movement between an observer and a wave's source.
"This is the first time that the inverse Doppler effect has been demonstrated in the optical region," says Professor Min Gu, Director of Swinburne's Centre for Micro-Photonics.