Quasi-Phase-Matched Second Harmonic Generation in Poling-Free Lithium Niobate Microrings with Surface Molecular Pattern
Abstract
Thin film lithium niobate (TFLN) is a promising integrated photonic platform owing to its large quadratic nonlinearity enabling vital applications such as second-harmonic generation (SHG), optical parametric amplification, and spontaneous parametric down-conversion. However, to achieve high SH conversion efficiency, quasi-phase matching (QPM) through periodic electrical poling is typically required, which remains challenging in certain applications like multiple-ring coupled devices. Here, we demonstrate a surface molecule patterning strategy to enable QPM in a poling-free TFLN microring for SHG. An on-chip normalized conversion efficiency of approximately 11.5%/W is obtained in the poling-free TFLN microring with surface molecular pattern, showing an approximate 400-fold improvement compared to the same microring without surface molecular pattern. This approach offers a versatile route to engineer interfacial nonlinear interactions for nonlinear optics and quantum photonics applications and may be extended to multiple-ring coupled resonators and other platforms.
Related
- Metasurface-on-Lithium-Niobate Architecture for Spin-decoupled Second Harmonic Wavefront Shaping
- Strain-enhanced high-order harmonic generation in boron nitride nanotubes
- Nonclassical cutoff fluctuations in squeezed-light-driven high-harmonic generation
- Identifiability Limits of Scattering from Solid-State High-Harmonic Generation
- Automated mode-aware design of nonlinear photonic crystal cavities for intrinsic second harmonic generation
BibTeX
@misc{cheng2026quasiphasematched,
title = {{Quasi-Phase-Matched Second Harmonic Generation in Poling-Free Lithium Niobate Microrings with Surface Molecular Pattern}},
author = {Jinsong Cheng and Simin Yu and Jiahe Wang and Yilun Zhang and Juanjuan Lu and Xiaoqin Shen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29417},
eprint = {2610.29417},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29417},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Quasi-Phase-Matched Second Harmonic Generation in Poling-Free Lithium Niobate Microrings with Surface Molecular Pattern
AU - Jinsong Cheng
AU - Simin Yu
AU - Jiahe Wang
AU - Yilun Zhang
AU - Juanjuan Lu
AU - Xiaoqin Shen
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29417
UR - https://arxiv.org/abs/2610.29417
AB - Thin film lithium niobate (TFLN) is a promising integrated photonic platform owing to its large quadratic nonlinearity enabling vital applications such as second-harmonic generation (SHG), optical parametric amplification, and spontaneous parametric down-conversion. However, to achieve high SH conversion efficiency, quasi-phase matching (QPM) through periodic electrical poling is typically required, which remains challenging in certain applications like multiple-ring coupled devices. Here, we demonstrate a surface molecule patterning strategy to enable QPM in a poling-free TFLN microring for SHG. An on-chip normalized conversion efficiency of approximately 11.5%/W is obtained in the poling-free TFLN microring with surface molecular pattern, showing an approximate 400-fold improvement compared to the same microring without surface molecular pattern. This approach offers a versatile route to engineer interfacial nonlinear interactions for nonlinear optics and quantum photonics applications and may be extended to multiple-ring coupled resonators and other platforms.
ER -