博士论文答辩：微机械频率梳频带展宽与相位同步机制研究
日期：2026/05/15 – 2026/05/15
论文题目：微机械频率梳频带展宽与相位同步机制研究
主讲人：吴佳豪
时间：2026年5月15日（周五）下午1:30-3:00
地点：龙宾楼503会议室
讲座摘要
The concept of the frequency comb was first proposed in the field of optics and is characterized by a spectrum consisting of uniformly spaced discrete spectral lines. However, due to the strong reliance on ultra-stable lasers, high-precision optical cavities, and complex feedback control systems, achieving miniaturized, low-power, and highly integrated frequency combs remains a central challenge for their widespread application. Benefiting from advances in micro-electro-mechanical systems (MEMS) technology, MEMS-based micromechanical frequency combs (MFCs) demonstrate great potential for realizing low-power, highly stable, and large-scale integrated precision frequency standards at the chip level. Despite their considerable potential across a wide range of applications, investigations into MFCs remain at a relatively early stage.
This dissertation focuses on the fundamental generation mechanisms, dynamic regulation, spectral expansion, and frequency stabilization of MFCs, with the over-arching goal of advancing their applicability toward wideband, tunable, and highly stable chip-scale frequency references. By systematically investigating nonlinear internal resonance, stochastic and deterministic bifurcation dynamics, modal energy exchange, and self-injection locking phenomena in MEMS resonators, this work establishes a coherent physical framework that bridges nonlinear dynamics theory with experimental realization of high-performance MFCs.
主讲人介绍
Jiahao Wu received the B.E. degree in Mechanical Engineering from Shanghai Jiao Tong University, Shanghai, China, in 2021. He is currently pursuing the Ph.D. degree in Mechanical Engineering at Shanghai Jiao Tong University, Shanghai, China. His current research interests include mechanical frequency combs, MEMS resonators, and nonlinear dynamics. He was awarded the National Scholarship and the Shanghai Jiao Tong University Outstanding Graduates.