Visible and Online Detection of Near‐Infrared Optical Vortices via Nonlinear Photonic Crystals

Near‐infrared (NIR) optical vortices (OVs), which carry specific orbital angular momentum, are believed to greatly increase the capacity of conventional optical communication systems. However, due to the equipment limits in invisible wavelengths, NIR OVs detection remains a great difficulty. Here, t...

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Bibliographic Details
Published in:Advanced optical materials 2022-01, Vol.10 (1), p.n/a
Main Authors: Liu, Yuan, Chen, Wei, Zhang, Wang, Ma, Chao‐Qun, Chen, Huai‐Xi, Xiong, Yi‐Feng, Yuan, Rui, Tang, Jie, Chen, Peng, Hu, Wei, Xu, Fei, Lu, Yan‐Qing
Format: Article
Language:English
Subjects:
Angular momentum
Broadband
Channels
Communications systems
Conversion
Energy dissipation
Lithium niobates
Materials science
Multiprocessing
Near infrared radiation
near‐infrared detection
nonlinear photonic crystals
Optical communication
optical vortex
Optics
Photonic crystals
Vortices
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Summary:Near‐infrared (NIR) optical vortices (OVs), which carry specific orbital angular momentum, are believed to greatly increase the capacity of conventional optical communication systems. However, due to the equipment limits in invisible wavelengths, NIR OVs detection remains a great difficulty. Here, the up‐conversion imaging technology is exploited to circumvent using NIR detectors. A lithium niobate crystal with its quadratic susceptibility modulated by a specially designed Dammann vortex grating is fabricated to realize the frequency conversion—from NIR to the visible region—while converting multiplexed OVs to Gaussian modes in specific multichannels. During the detection process, the most of energies of the detected OVs are preserved, which can be considered as online detection. Additionally, at least 400 nm applicable wavelength range of this method is experimentally demonstrated, as well as up to 25 independent detection channels. Compared with existing solutions, this scheme enables a large‐broadband wavelength, low energy loss, and multiprocessing channels platform for visible detection of NIR OVs, showing great potential to be applied in optical communication systems. A novel scheme of visible detection method to near‐infrared optical vortices, based on asymmetrically engineered nonlinear photonic crystals, is theoretically proposed and experimentally demonstrated. This work provides a large‐broadband wavelength, low energy loss, and multiprocessing channels platform for visible detection of near‐infrared optical vortices promising to be applied in optical communication systems.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202101098