Journal
SCIENCE
Volume 333, Issue 6038, Pages 65-67Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1203984
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Funding
- UK Engineering and Physical Sciences Research Council
- Royal Society
- Wolfson Foundation
- European Commission [FP7-ICT-255914]
- Defense Advanced Research Projects Agency (DARPA)-DSO Slow Light Program
- Defense Threat Reduction Agency-Joint Science and Technology Office for Chemical and Biological Defense [HDTRA1-10-1-0025]
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Transmission through a spinning window slightly rotates the polarization of the light, typically by a microradian. It has been predicted that the same mechanism should also rotate an image. Because this rotary photon drag has a contribution that is inversely proportional to the group velocity, the image rotation is expected to increase in a slow-light medium. Using a ruby window under conditions for coherent population oscillations, we induced an effective group index of about 1 million. The resulting rotation angle was large enough to be observed by the eye. This result shows that rotary photon drag applies to images as well as polarization. The possibility of switching between different rotation states may offer new opportunities for controlled image coding.
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