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

Mikkel T. Hansen; Emil Z. Ulsig; Fabien Labbé; Magnus L. Madsen; Yunhong Ding; Karsten Rottwitt; Nicolas Volet

doi:10.3389/fphot.2023.1324648

Frontiers in Photonics (Dec 2023)

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

Mikkel T. Hansen,
Emil Z. Ulsig,
Fabien Labbé,
Magnus L. Madsen,
Yunhong Ding,
Karsten Rottwitt,
Nicolas Volet

Affiliations

Mikkel T. Hansen: Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark
Emil Z. Ulsig: Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark
Fabien Labbé: DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
Magnus L. Madsen: Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark
Yunhong Ding: DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
Karsten Rottwitt: DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
Nicolas Volet: Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark

DOI: https://doi.org/10.3389/fphot.2023.1324648
Journal volume & issue: Vol. 4

Abstract

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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).

Published in Frontiers in Photonics

ISSN: 2673-6853 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: https://www.frontiersin.org/journals/photonics#

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