%AChen, Jia-Yang%ATang, Chao%AMa, Zhao-Hui%ALi, Zhan%AMeng Sua, Yong%AHuang, Yu-Ping%BJournal Name: Optics Letters; Journal Volume: 45; Journal Issue: 13; Related Information: CHORUS Timestamp: 2022-09-15 15:25:11 %D2020%IOptical Society of America %JJournal Name: Optics Letters; Journal Volume: 45; Journal Issue: 13; Related Information: CHORUS Timestamp: 2022-09-15 15:25:11 %K %MOSTI ID: 10166472 %PMedium: X %TEfficient and highly tunable second-harmonic generation in Z-cut periodically poled lithium niobate nanowaveguides %X

Thin-film lithium-niobate-on-insulator (LNOI) has emerged as a superior integrated-photonics platform for linear, nonlinear, and electro-optics. Here we combine quasi-phase-matching, dispersion engineering, and tight mode confinement to realize nonlinear parametric processes with both high efficiency and wide wavelength tunability. On a millimeter-long, Z-cut LNOI waveguide, we demonstrate efficient (1900±<#comment/>500%<#comment/>W−<#comment/>1cm−<#comment/>2) and highly tunable (−<#comment/>1.71nm/K) second-harmonic generation from 1530 to 1583 nm by type-0 quasi-phase-matching. Our technique is applicable to optical harmonic generation, quantum light sources, frequency conversion, and many other photonic information processes across visible to mid-IR spectral bands.

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