Abstract
Remotely sensing an object with light is essential for burgeoning
technologies, such as autonomous vehicles. Here, an object’s rotational
orientation is remotely sensed using light’s orbital angular momentum. An
object is illuminated by and partially obstructs a Gaussian light beam. Using
an SLM, the phase differences between the partially obstructed Gaussian light
beam’s constituent OAM modes are measured analogous to Stokes polarimetry. It
is shown that the phase differences are directly proportional to the object’s
rotational orientation. Comparison to the use of a pixelated camera and
implementation in the millimeter wave regime are discussed.
© 2017 Chinese Laser Press
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