Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides

By Cheng Wang, C. Langrock, A. Marandi, M. Jankowski, Mian Zhang, B. Desiatov, M. Fejer, Marko Loncar. Optica, 2018

449 citations recorded by the source corpus.

Periodically poled lithium niobate (PPLN) waveguide is a powerful platform for efficient wavelength conversion. Conventional PPLN converters however typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use a nanostructured PPLN waveguides to demonstrate an ultrahigh normalized efficiency of 2600%/W-cm$^2$ for second-harmonic generation of 1.5-$\mu$m radiation, more than 20 times higher than that in state-of-the-art diffused waveguides. This is achieved by a combination of sub-wavelength optical confinement and high-fidelity periodic poling at a first-order poling period of 4 $\mu$m. Our highly integrated PPLN waveguides are promising for future chip-scale integration of classical and quantum photonic systems.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/57e545d4f3def660f48345e377c2ef5af5d81e38

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

Citations in the corpus

Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, background): “For second-order nonlinear processes, thin-film lithium-niobate-on-insulator (LNOI) [128], [129] and AlN [130] have shown particular promise, given their wide optical transparency window, very low optical losses [131], [132], appreciable nonlinear coefficients, and amenability to nanofabricati”