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15 - General Engineering
University of Glasgow
Detection of a Spinning Object Using Light's Orbital Angular Momentum
This paper reports the first realisation of an angular form of Doppler Velocimetry. We analyze the orbital angular momentum of normal light scattered from a rotating object, and show that the object's rotational speed can be inferred from a frequency shift of this light. Four news articles were published covering this work in Science News, Physics World, Physics Central and Science Now (www.gla.ac.uk/schools/physics/research/groups/optics/mediacoverage/). It has also been nominated for the Emil Wolf Prize at FIO 2013 (www.frontiersinoptics.com/home/). Remotely detecting the rotation of a body with an angular momentum directed along the observation direction has terrestrial and astronomical applications.