Orbital angular momentum of photons in noncollinear parametric downconversion

Gabriel Molina-Terriza; Juan P. Torres; Lluis Torner

doi:10.1016/j.optcom.2003.09.071

Orbital angular momentum of photons in noncollinear parametric downconversion

Gabriel Molina-Terriza^*, Juan P. Torres, Lluis Torner

^*Corresponding author for this work

Research output: Contribution to journal › Article

44 Citations (Scopus)

Abstract

Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.

Original language	English
Pages (from-to)	155-160
Number of pages	6
Journal	Optics Communications
Volume	228
Issue number	1-3
DOIs	https://doi.org/10.1016/j.optcom.2003.09.071
Publication status	Published - 1 Dec 2003
Externally published	Yes

Keywords

Orbital angular momentum
Spontaneous parametric downconversion

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abstract = "Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100{\%}. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.",

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AU - Molina-Terriza, Gabriel

AU - Torres, Juan P.

AU - Torner, Lluis

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N2 - Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.

AB - Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.

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KW - Spontaneous parametric downconversion

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