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

By Juanjuan Lu, Joshua B. Surya, Xianwen Liu, Alexander W. Bruch, Zheng Gong, Yuntao Xu, Hong X. Tang. Optica, 2019

300 citations recorded by the source corpus.

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 ($\chi^{(2)}$), LN inspires many important applications such as second-harmonic generation (SHG), spontaneous parametric down-conversion, 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 1617nm, 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$\mu$W in the waveguide. Such periodically poled LN microrings also present a versatile platform for other cavity-enhanced quasi-phase matched $\chi^{(2)}$ nonlinear optical processes.

Subfields: Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/00f7c5030a295637a5ddbf4739ff40b5ca8d090d

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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”
Advances in on-chip photonic devices based on lithium niobate on insulator (2020, methodology): “On the contrary, although EBL is a slow process, it is much faster than FIB, thereby allowing the production of a variety of novel nanophotonic devices on the LNOI in many research laboratories worldwide, due to the popularity of the EBL and RIE systems [44,60,71,111–117].”
Advances in lithium niobate photonics: development status and perspectives (2022, background): “engineered microring with a high Q factor, Kerr comb generation has been demonstrated in the TFLN platform.(63,74,75) Figure 16(d) shows one example of an on-chip photonic inte-”
Integrated lithium niobate photonics (2020, methodology): “As a result, this PPLN microring demonstrates an SHG efficiency as high as 250,000%/W – the state-of-the-art value provided by integrated photonics platforms [109].”
Ultralow-threshold thin-film lithium niobate optical parametric oscillator (2021, methodology): “The coupling design is elaborated in our previous work [1].”