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

作者：Wang, Cheng; Langrock, Carsten; Marandi, Alireza; Jankowski, Marc; Zhang, Mian; Desiatov, Boris; Fejer, Martin M.^*; Loncar, Marko

来源：Optica, 2018, 5(11): 1438-1441.

DOI：10.1364/OPTICA.5.001438

• REVERSE PROTON-EXCHANGE
• 2ND-HARMONIC GENERATION
• THIN-FILM
• NONLINEARITIES
• RESONATORS
• CONVERTERS
• DEVICES
• LINBO3

Periodically poled lithium niobate (PPLN) waveguides are 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 waveguide 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.

• 出版日期2018-11-20