Photorefraction-induced Bragg scattering in cryogenic lithium niobate ring resonators

铌酸锂波导中的光折变管理：高温与低温解决方案

Photorefraction Management in Lithium Niobate Waveguides: High-Temperature vs. Cryogenic Solutions

本文提出了一种适用于低温环境的光折变管理方法，通过辅助光源恢复相匹配光谱并减少热电效应，以提升铌酸锂波导在非线性光学应用中的性能。

Stable tuning of photorefractive micro-cavities using an auxiliary laser

Cavity nonlinear optics enables intriguing physical phenomena to occur at micro- or nano-scales with modest input powers. While this enhances capabilities in applications such as comb generation, frequency conversion and quantum optics, undesired nonlinear effects including photorefraction and thermal bistability are exacerbated. In this letter, we propose and demonstrate a highly effective method of achieving cavity stabilization using an auxiliary laser for controlling photorefraction in a z-cut periodically poled lithium niobate (LN) microcavity system. Our numerical study accurately models…

薄膜铌酸锂圆形布拉格纳米腔中增强的二次谐波产生

Enhanced Second-Harmonic Generation in Thin-Film Lithium Niobate Circular Bragg Nanocavity

针对铌酸锂纳米尺度光约束受限的问题，研究人员利用支持谐振anapole模的二阶圆形布拉格光栅纳米腔，在薄膜铌酸锂中实现了创纪录的高增强二次谐波产生，还验证了偏振不敏感特性，为纳米非线性光学研究提供新思路。

High-quality lithium niobate photonic crystal nanocavities

Lithium niobate (LN) exhibits unique material characteristics that have found many important applications. Scaling LN devices down to a nanoscopic scale can dramatically enhance light-matter interaction that would enable nonlinear and quantum photonic functionalities beyond the reach of conventional means. However, developing LN-based nanophotonic devices turns out to be nontrivial. Although significant efforts have been devoted in recent years, LN photonic crystal structures developed to date exhibit fairly low quality. Here we demonstrate LN photonic crystal nanobeam resonators with optical …

铌酸锂上可重构单环光子分子

Reconfigurable Single-Ring Photonic Molecule on Lithium Niobate

提出在铌酸锂微环谐振器中利用光折变光栅实现可编程、可擦写的单环光子分子，实现GHz级模式分裂和可调谐耦合，并应用于毫米波单边带转换。

Tunable ultra-narrowband grating filters in thin-film lithium niobate

Several applications in modern photonics require compact on-chip optical filters with a tailored spectral response. However, achieving sub-nanometric bandwidths and high extinction ratios is particularly challenging, especially in low-footprint device formats. Phase shifted Bragg gratings implemented by sidewall modulation of photonic nanowire waveguides are a good solution for on-chip narrowband operation with reasonable requirements in fabrication and scalability. In this work we report on their implementation and optimization in thin film lithium niobate, a photonic platform that affords re…