Detecting Lateral Motion using Light’s Orbital Angular Momentum

@article{Cvijetic2015DetectingLM,
  title={Detecting Lateral Motion using Light’s Orbital Angular Momentum},
  author={Neda Cvijetic and Giovanni Milione and Ezra Ip and Ting Wang},
  journal={Scientific Reports},
  year={2015},
  volume={5}
}
Interrogating an object with a light beam and analyzing the scattered light can reveal kinematic information about the object, which is vital for applications ranging from autonomous vehicles to gesture recognition and virtual reality. We show that by analyzing the change in the orbital angular momentum (OAM) of a tilted light beam eclipsed by a moving object, lateral motion of the object can be detected in an arbitrary direction using a single light beam and without object image reconstruction… 
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References

SHOWING 1-10 OF 37 REFERENCES
Detection of a Spinning Object Using Light’s Orbital Angular Momentum
TLDR
Using twisted light, Lavery et al. detected rotation with an analogous angular Doppler shift, which may be useful for remote sensing and observational astronomy, and the multiplicative enhancement of the frequency shift may have applications for the remote detection of rotating bodies in both terrestrial and astronomical settings.
Orbital angular momentum: origins, behavior and applications
As they travel through space, some light beams rotate. Such light beams have angular momentum. There are two particularly important ways in which a light beam can rotate: if every polarization vector
Measurement of the light orbital angular momentum spectrum using an optical geometric transformation
We recently demonstrated a new method to efficiently analyse the orbital angular momentum (OAM) states of light by application of an optical geometric transformation (Berkhout et al 2010 Phys. Rev.
Tweezers with a twist
The fact that light carries both linear and angular momentum is well-known to physicists. One application of the linear momentum of light is for optical tweezers, in which the refraction of a laser
Analysis of orbital angular momentum of a misaligned optical beam
We report an analysis of the orbital angular momentum of an optical beam misaligned with respect to a reference axis. Both laterally displaced and angularly deflected Laguerre–Gaussian beams are
Advances in optical angular momentum
Some 16 years ago, Allen et al. [Phys. Rev. A 45, 8185 (1992)] recognised that laser beams which carried an angular momentum additional to photon spin, could be realized in the laboratory. Such beams
Angular diffraction
Angle and angular momentum are linked by a Fourier transformation. A restriction of the angular range within an optical beam profile therefore generates orbital angular momentum (OAM) sidebands on
Application of orbital angular momentum to simultaneous determination of tilt and lateral displacement of a misaligned laser beam.
TLDR
The theory explains the symmetries and properties of the spectrum under the influence of misalignments and an improved technique for obtaining the orbital angular momentum spectrum employing Laguerre-Gaussian modes is proposed.
Internal flows and energy circulation in light beams
We review optical phenomena associated with the internal energy redistribution which accompany propagation and transformations of monochromatic light fields in homogeneous media. The total energy
Intrinsic and extrinsic nature of the orbital angular momentum of a light beam.
TLDR
Numerical calculations of both spin and orbital angular momentum are confirmed by means of experiments with particles trapped off axis in optical tweezers, where the size of the particle means it interacts with only a fraction of the beam profile.
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