Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W

Juanjuan Lu, Joshua B. Surya, Xianwen Liu, Alexander W. Bruch, Zheng Gong, Yuntao Xu, Hong X. Tang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

318 Citations (Scopus)

Abstract

Lithium niobate (LN), dubbed by many as the silicon of photonics, has recently risen to the forefront of chip-scale nonlinear optics research since its demonstration as an ultralow-loss integrated photonics platform. Due to its significant quadratic nonlinearity (χ(2)), LN inspires many important applications such as second-harmonic generation (SHG), spontaneous parametric downconversion, and optical parametric oscillation. Here, we demonstrate high-efficiency SHG in dual-resonant, periodically poled z-cut LN microrings, where quasi-phase matching is realized by field-assisted domain engineering. Meanwhile, dual-band operation is accessed by optimizing the coupling conditions in fundamental and second-harmonic bands via a single pulley waveguide. As a result, when pumping a periodically poled LN microring in the low power regime at around 1617 nm, an on-chip SHG efficiency of 250,000%/W is achieved, a state-of-the-art value reported among current integrated photonics platforms. An absolute conversion efficiency of 15% is recorded with a low pump power of 115 μW in the waveguide. Such periodically poled LN microrings also present a versatile platform for other cavity-enhanced quasi-phase-matched χ(2) nonlinear optical processes.

Original languageEnglish
Pages (from-to)1455-1460
Number of pages6
JournalOptica
Volume6
Issue number12
DOIs
Publication statusPublished - 2019
Externally publishedYes

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