Measuring the orbital angular momentum of light by dynamic polygon apertures

Dina Grace Banguilan; Nestor Bareza Jr.; Esmerando Escoto; Nathaniel Hermosa

doi:10.1117/12.2500986

8 November 2018 Measuring the orbital angular momentum of light by dynamic polygon apertures

Dina Grace Banguilan, Nestor Bareza Jr., Esmerando Escoto, Nathaniel Hermosa

Proceedings Volume 10818, Holography, Diffractive Optics, and Applications VIII; 108180U (2018) https://doi.org/10.1117/12.2500986
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

We offer a convenient and dynamic method for the measurement of the orbital angular momentum of light using its distinct Fraunhofer diffraction patterns(FDPs) after passing through programmable apertures generated by a digital micromirror device (DMD). The DMD allows for a practical way of testing and centering several apertures, while minimizing movements in the setup in between measurements. We show how to extract the topological charge value, polarity, and parity from the resulting patterns, along with the limitations of each polygon shape, such as the symmetry and uniqueness issues. An experimental demonstration is also provided, confirming the expected patterns simulated using the far-field diffraction integral. This study establishes the potential speed and accuracy brought by the use of a DMD for the challenging task of characterizing the orbital angular momentum of light.

Citation Download Citation

Dina Grace Banguilan, Nestor Bareza Jr., Esmerando Escoto, and Nathaniel Hermosa "Measuring the orbital angular momentum of light by dynamic polygon apertures", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108180U (8 November 2018); https://doi.org/10.1117/12.2500986

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