上海交通大学智能微波光波融合创新中心（imLic）访问老师陈静的工作——Three-Dimensional Optical-Electrical-Thermal Multi-Physical Analysis and Optimization in Thin Film Lithium Niobate Based Electro-Optic Modulator（基于铌酸锂薄膜光电调制器中的三维光电热多物理场耦合分析和优化）的相关成果近期被Photonic Journal期刊接收发表，该工作得到了国家重点研发计划（2019YFB2203700）、国家自然科学基金（61822508）的部分资助。该工作利用COMSOL有限元分析方法首次建立了三维铌酸锂薄膜光电调制器中的光学-电学-热学多物理场的模型，仿真得到的光电效应和文献报道的实验结果非常一致，文章重点探索了电和光产生的热效应所引起的温度升高及分布的不均匀性，研究发现器件中热效应随微波频率的增加而增强，此外，电极间的间距直接决定了光的吸收，从而对热量的分布也有影响。基于此，本文指出在设计调制器器件结构和性能的时候，应综合考虑热因素对器件的作用，同时给出了指导性的建议。
摘要: We demonstrate a three-dimensional (3D) investigation of optical-electrical-thermal multi-physical effect in thin film lithium niobate based electro-optic on-chip modulator. For the first time, the 3D visualizations of the optical field, the microwave field, and thermal field are carried out. The obtained key performances of modulator such as half wave voltage and modulation bandwidth are basically consistent with the reported experimental data. This report emphasizes on the thermal effect investigation such as the heating dissipation and steady-state temperature distribution. Besides, the dependencies of heating and temperature increment on the microwave frequency and the electrode gap are discussed quantitatively, and optimization of the modulator design is then presented from the perspective of thermal effect.