腾讯会议ID：979-221-995

会议密码：0703

主持人：李玉同 研究员

联系人：傅琦 (fuqi@iphy.ac.cn)

Abstract：

The terahertz (THz) spectral region provides unique access to fundamental light-matter interactions, enabling direct probing of charge, lattice, and spin dynamics. THz time-domain spectroscopy (THz-TDS) has therefore become a powerful tool for the ultrafast characterization of materials. While air-plasma-based THz sources offer ultrabroadband coverage, recent advances in nonlinear optical crystals enable compact, efficient solid-state THz platforms with complementary capabilities.

In this talk, I will present our recent progress in solid-state THz generation and spectroscopy based on nonlinear optical crystal systems. I will first discuss lithium niobate (LN)-based ultrabroadband THz emission, where strongly phase-mismatched optical rectification enables intense single-cycle THz fields with exceptionally broad spectral coverage. I will then highlight a new class of high-frequency THz sources based on borate nonlinear crystals, including BBO, LBO, CBO, and BIBO. These systems enable narrowband-to-moderately broadband emission in the multi-THz regime, offering complementary functionality to ultrabroadband sources. Finally, I will demonstrate how these solid-state THz technologies enable advanced spectroscopic studies of material responses across both linear and nonlinear regimes.

Brief CV of Prof. Binbin Zhou：

Binbin Zhou is an Associate Professor at the Technical University of Denmark (DTU), where he leads a research team in ultrafast THz science. He received his Ph.D. in Optical Physics from the Institute of Physics, Chinese Academy of Sciences, in 2009. Since joining DTU in 2009, he has worked as postdoctoral Researcher, Researcher, Senior Researcher, and was appointed Associate Professor in 2021.

His research focuses on ultrafast terahertz spectroscopy, with emphasis on the development of advanced THz generation and detection techniques and their application to quantum materials, semiconductors, and complex functional systems. He has authored more than 60 peer-reviewed publications in journals including Physical Review Letters, Nature Photonics, Optica, and Advanced Materials. His research has been supported by the Independent Research Fund Denmark, the Novo Nordisk Foundation, and the Villum Foundation.