Efficient and robust second-harmonic generation in thin-film lithium niobate using modal phase matching

A double-ridge waveguide is designed for efficient and robust second-harmonic generation (SHG) using the thin-film lithium-niobate-on-insulator (LNOI) platform. Perfect phase matching (PhM) is achieved between the fundamental waveguide mode at 1,550 nm and a higher-order mode at the second harmonic....

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Bibliographic Details
Published in:Frontiers in photonics 2023-12, Vol.4
Main Authors: Hansen, Mikkel T., Ulsig, Emil Z., Labbé, Fabien, Madsen, Magnus L., Ding, Yunhong, Rottwitt, Karsten, Volet, Nicolas
Format: Article
Language:English
Subjects:
frequency conversion
higher-order modes
nonlinear waveguides
second-harmonic generation
single photons
thin-film LNOI
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Summary:A double-ridge waveguide is designed for efficient and robust second-harmonic generation (SHG) using the thin-film lithium-niobate-on-insulator (LNOI) platform. Perfect phase matching (PhM) is achieved between the fundamental waveguide mode at 1,550 nm and a higher-order mode at the second harmonic. The fabrication tolerances of the PhM condition are simulated using a finite-difference method mode solver, and conversion efficiencies as high as 3.92 W −1 are obtained for a 1-cm long waveguide. This design allows access to the largest element of the second-order nonlinear susceptibility tensor, and represents a scalable alternative to waveguides based on periodically-poled lithium niobate (PPLN). The design has the potential for generating pairs of entangled photons in the infrared C-band by spontaneous parametric down-conversion (SPDC).
ISSN:2673-6853
2673-6853
DOI:10.3389/fphot.2023.1324648