Twisted photons: new classical and quantum applications

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

doi:10.1117/12.625393

11 October 2005 Twisted photons: new classical and quantum applications

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

Proceedings Volume 5958, Lasers and Applications; 59581O (2005) https://doi.org/10.1117/12.625393
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

Twisted light, or light with orbital angular momentum (OAM), plays an emerging role in both classical and quantum science, with important applications in areas as diverse as biophotonics, micromachines, spintronics, or quantum information. It offers fascinating opportunities for exploring new fundamental ideas in physics, as well as for being used as a tool for practical applications. One important point is to determine how to generate single photons, and two-photon states, with an appropriate OAM content. Here we describe the paraxial orbital angular momentum of entangled photon pairs generated by spontaneous parametric down-conversion (SPDC) in different non-collinear geometries. These geometries introduce a variety of new features. In particular, we find the OAM of entangled pairs generated in purely transverse-emitting configurations, where the entangled photons counter-propagate perpendicularly to the direction of propagation of the pump beam. The spatial walk-off of all interacting waves in the parametric process also determines the OAM content of the down-converted photons, and here its influence is also revealed.

Citation Download Citation

Juan P. Torres, Gabriel Molina-Terriza, and Lluis Torner "Twisted photons: new classical and quantum applications", Proc. SPIE 5958, Lasers and Applications, 59581O (11 October 2005); https://doi.org/10.1117/12.625393

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