Infrared vortex detection with nonlinear Young's double-slit interference

Haizheng LI; Yidan SUN; Xiaodong QIU; Lixiang CHEN

doi:10.1364/OE.585773

Infrared vortex detection with nonlinear Young's double-slit interference

Haizheng LI (Co-first Author), Yidan SUN (Co-first Author), Xiaodong QIU^*, Lixiang CHEN^*

^*Corresponding author for this work

Department of Electrical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

Different from the plane wave, the vortex beam passing through a Young’s double slit will produce an interference pattern with lateral shear, where the degree of lateral shear is determined by the beam’s topological charge, namely, providing a quantitative method for measuring the topological charge of vortex beams. However, limited by the detection efficiency, noise, and cost of infrared cameras, using Young’s double-slit interference to measure infrared optical vortex modes remains relatively unexplored. Here, we construct a nonlinear Young’s double slit, such that when an infrared optical vortex beam passes through it, interference fringes with lateral shear can be observed in the visible region. In our experiment, we successfully measured nine vortex modes with different topological charges using a visible camera, overcoming the performance limitations of infrared detectors. This scheme holds great promise for infrared vortex-encoded optical communications. © 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Original language	English
Pages (from-to)	718-725
Journal	Optics Express
Volume	34
Issue number	1
Online published	5 Jan 2026
DOIs	https://doi.org/10.1364/OE.585773
Publication status	Published - 12 Jan 2026

Funding

National Key R&D Program of China (2023YFA1407200); National Natural Science Foundation of China (12034016, 12374280).

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: © 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.

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title = "Infrared vortex detection with nonlinear Young's double-slit interference",

abstract = "Different from the plane wave, the vortex beam passing through a Young{\textquoteright}s double slit will produce an interference pattern with lateral shear, where the degree of lateral shear is determined by the beam{\textquoteright}s topological charge, namely, providing a quantitative method for measuring the topological charge of vortex beams. However, limited by the detection efficiency, noise, and cost of infrared cameras, using Young{\textquoteright}s double-slit interference to measure infrared optical vortex modes remains relatively unexplored. Here, we construct a nonlinear Young{\textquoteright}s double slit, such that when an infrared optical vortex beam passes through it, interference fringes with lateral shear can be observed in the visible region. In our experiment, we successfully measured nine vortex modes with different topological charges using a visible camera, overcoming the performance limitations of infrared detectors. This scheme holds great promise for infrared vortex-encoded optical communications. {\textcopyright} 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement",

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N2 - Different from the plane wave, the vortex beam passing through a Young’s double slit will produce an interference pattern with lateral shear, where the degree of lateral shear is determined by the beam’s topological charge, namely, providing a quantitative method for measuring the topological charge of vortex beams. However, limited by the detection efficiency, noise, and cost of infrared cameras, using Young’s double-slit interference to measure infrared optical vortex modes remains relatively unexplored. Here, we construct a nonlinear Young’s double slit, such that when an infrared optical vortex beam passes through it, interference fringes with lateral shear can be observed in the visible region. In our experiment, we successfully measured nine vortex modes with different topological charges using a visible camera, overcoming the performance limitations of infrared detectors. This scheme holds great promise for infrared vortex-encoded optical communications. © 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

AB - Different from the plane wave, the vortex beam passing through a Young’s double slit will produce an interference pattern with lateral shear, where the degree of lateral shear is determined by the beam’s topological charge, namely, providing a quantitative method for measuring the topological charge of vortex beams. However, limited by the detection efficiency, noise, and cost of infrared cameras, using Young’s double-slit interference to measure infrared optical vortex modes remains relatively unexplored. Here, we construct a nonlinear Young’s double slit, such that when an infrared optical vortex beam passes through it, interference fringes with lateral shear can be observed in the visible region. In our experiment, we successfully measured nine vortex modes with different topological charges using a visible camera, overcoming the performance limitations of infrared detectors. This scheme holds great promise for infrared vortex-encoded optical communications. © 2026 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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Infrared vortex detection with nonlinear Young's double-slit interference

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