Generation of Sources of Light with Well Defined Orbital Angular Momentum

Quantum Fest 2015

Y Cruz, S. Cruz^1 ; Escamilla, N.^1 ; Velázquez, V.^2

Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional 2580, Barrio la Laguna Ticoman, Gustavo A. Madero

07340, Mexico^1

Facultad de Ciencias, Universidad Nacional Autónoma de México, Apartado Postal 70-543, Ciudad de México

04510, Mexico^2

关键词: Diffractive grating;    Electromagnetic modes;    Laguerre-Gaussian modes;    Orbital angular momentum;    Quantum regimes;    Signal paths;    Single photons;    Spontaneous parametric down conversion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/698/1/012016/pdf
DOI  :  10.1088/1742-6596/698/1/012016

来源: IOP

【 摘 要 】

In this work, a technique to produce spatial electromagnetic modes with definite orbital angular momentum is presented. The method is based in the construction of binary diffractive gratings generated by computer. In the classical regime the gratings produce the well known Laguerre-Gaussian modes distributions when illuminated by a plane wave. In the quantum regime the grating is placed in the signal path of a spontaneous parametric down conversion layout and the diffraction pattern, observed in the coincidence count rate, shows that the single photons are projected onto spatial states consistent with a Laguerre-Gaussian modes distribution.