Photon Orbital Angular Momentum in Astrophysics

Harwit, Martin

doi:10.1086/378623

Cited by 245 publications

(168 citation statements)

References 22 publications

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“…The method has a limitation due to the overlap of the spots for different states that could be reduced by applying an additional diffraction grating to the first surface. The system opens the way to many interesting investigations ranging from experiments in multiport quantum entanglement [7], to applications in astrophysics [24] and microscopy [25], all of which make use of the OAM state basis.…”

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confidence: 99%

Efficient Sorting of Orbital Angular Momentum States of Light

et al. 2010

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We present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. The optical elements perform a Cartesian to log-polar coordinate transformation, converting the helically phased light beam corresponding to OAM states into a beam with a transverse phase gradient. A subsequent lens then focuses each input OAM state to a different lateral position. We demonstrate the concept experimentally by using two spatial light modulators to create the desired optical elements, applying it to the separation of eleven OAM states.

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confidence: 99%

Efficient Sorting of Orbital Angular Momentum States of Light

et al. 2010

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“…In [10][11][12][13] it is implied that light is an electromagnetic wave. It carries electric and magnetic fields.…”

Section: Velocity and System Of Photonmentioning

confidence: 99%

A Classical Approach of Unified Field

Das

Misra

2013

ILCPA

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Photons contribute electromagnetic field that accompanies the gravitational field. These two fields may be, mutually, transformed through a kind of transformation matrix dependent upon the boundary conditions of the system. In this work trial would be made to find the nature of this transformation matrix considering a super system of photon in which both fields are unified. The unification of electromagnetic and gravitational fields leads to the concept of fundamental charge.

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“…Photonic orbital angular momentum (POAM), the fifth property of light, may be of significant interest to the astronomical community (Harwit 2003;Elias 2008). Since the discovery by Allen et al (1992) that POAM can be easily created in the laboratory, it has been found in virtually every field of optics Yao & Padgett (2011);Tamburini et al (2012); Shalaev et al (2013); Kim et al (2013); Chen et al (2013) ;Cristi & Axtell (2013); Sun et al (2013); Ruane & Swatzlander (2013); Roux (2013); this ubiquity is evident in the more than 1000 papers citing the original work (Allen et al 1992).…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, several other methods have been developed to generate POAM in the laboratory (Oemrawsingh et al 2004;Gibson et al 2004;Gruneisen et al 2008). LaguerreGaussian beams are known as optical vortex beams because of their phase structure which is proportional to e ımφ , using the azimuthal angle, φ, and the OAM index, m. All of the photons in these optical vortex beams carry m of OAM (Harwit 2003). Identifying the states from such beams however, can be problematic and several different types of OAM sorters have been developed (Gruneisen et al 2008;Lavery et al 2011a,b;Sponselli & Lavery 2013).…”

Section: Introductionmentioning

confidence: 99%

Photonic orbital angular momentum in starlight

Oesch

Sanchez

2014

A&A

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Context. Each attempt by the Atmospheric Simulation and Adaptive-optics Laboratory Testbed (ASALT) research group to detect turbulence-induced photonic orbital angular momentum (POAM) has been successful, spanning laboratory, simulation and field experiments, with the possible exception of the 2011 Starfire Optical Range (SOR) astronomical observations, a search for POAM induced by astronomical sources. Aims. The purposes of this work are to discuss how POAM from astronomical turbulent assemblages of molecules or atoms (TAMA) would appear in observations and then to reanalyze the data from the 2011 SOR observations using a more refined technique as a demonstration of POAM in starlight. Methods. This work uses the method of projections used previously in analysis of terrestrial data. Results. Using the method of projections, the noise floor of the system was reevaluated and is found to be no greater than 1%. Reevaluation of the 2011 SOR observations reveals that a POAM signal is evident in all of the data. Conclusions. POAM signals have been found in every instance of extended propagation through turbulence conducted by the ASALT research group, including the 2011 SOR observations. POAM is an inevitable result of the propagation of optical waves through turbulence.

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Photon Orbital Angular Momentum in Astrophysics

Cited by 245 publications

References 22 publications

Efficient Sorting of Orbital Angular Momentum States of Light

Efficient Sorting of Orbital Angular Momentum States of Light

A Classical Approach of Unified Field

Photonic orbital angular momentum in starlight

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