Free-space propagation of high-dimensional structured optical fields in an urban environment

Lavery MPJ, Peuntinger C, Günthner K, Banzer P, Elser DA, Boyd RW, Padgett MJ, Marquardt C, Leuchs G (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Book Volume: 3

Article Number: e1700552

Journal Issue: 10

DOI: 10.1126/sciadv.1700552

Abstract

Spatially structured optical fields have been used to enhance the functionality of a wide variety of systems that use light for sensing or information transfer. As higher-dimensional modes become a solution of choice in optical systems, it is important to develop channel models that suitably predict the effect of atmospheric turbulence on these modes. We investigate the propagation of a set of orthogonal spatial modes across a free-space channel between two buildings separated by 1.6 km. Given the circular geometry of a common optical lens, the orthogonal mode set we choose to implement is that described by the Laguerre-Gaussian (LG) field equations. Our study focuses on the preservation of phase purity, which is vital for spatial multiplexing and any system requiring full quantum-state tomography. We present experimental data for the modal degradation in a real urban environment and draw a comparison to recognized theoretical predictions of the link. Our findings indicate that adaptations to channel models are required to simulate the effects of atmospheric turbulence placed on high-dimensional structured modes that propagate over a long distance. Our study indicates that with mitigation of vortex splitting, potentially through precorrection techniques, one could overcome the challenges in a real point-to-point free-space channel in an urban environment.

Authors with CRIS profile

Involved external institutions

University of Glasgow United Kingdom (GB)

How to cite

APA:

Lavery, M.P.J., Peuntinger, C., Günthner, K., Banzer, P., Elser, D.A., Boyd, R.W.,... Leuchs, G. (2017). Free-space propagation of high-dimensional structured optical fields in an urban environment. Science Advances, 3(10). https://doi.org/10.1126/sciadv.1700552

MLA:

Lavery, Martin P. J., et al. "Free-space propagation of high-dimensional structured optical fields in an urban environment." Science Advances 3.10 (2017).

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