The quantum confinement, proximity effects and specific structure occurring at material interfaces have led to the discovery of numerous novel physical and chemical phenomena These revelations offer unprecedented opportunities for tailoring material properties and advancing the realm of interface-based devices. To comprehend the microscopic intricacies of these interfaces and optimize their efficiency, the development of in-situ detection and manipulation methods, particularly those sensitive to interfaces, becomes imperative.

This invited talk will discuss the realm of interface science, focusing on cutting-edge methods in interface-sensitive nonlinear spectroscopy. Highlighting the role of nonlinear optical spectroscopy as a pivotal analytical tool, we will explore its significance in studying light-matter interactions and material properties in situ. The discussion will extend to the emerging field of interface-sensitive terahertz nonlinear spectroscopy, presenting a novel dimension in our ability to probe interfaces. The presentation will showcase various applications of these advanced spectroscopic techniques in analyzing the microstructure of interfaces and unraveling the intricacies of chemical reaction processes.

References：

1. Y.C. Wen, C.S. Tian et al., Unveiling Microscopic Structures of Charged Water Interfaces by Surface-Specific Vibrational Spectroscopy, Phys. Rev. Lett. 116, 016101(2016).

2. Shanshan Yang, C.S. Tian et al. Mechanism of Electric Power Generation from Ionic Droplet Motion on Polymer Supported Graphene. JACS 140, 13746 (2018).

3. Ying Xu, C.S. Tian et al., Structure evolution at the gate-tunable suspended graphene–water interface, Nature 621, 506 (2023).

4. Y.D. Su, C.S. Tian et al., Low-frequency Phonon at Perovskite Oxide Interface Studied by Surface-specific Nonlinear Terahertz Spectroscopy, Ultrafast Science 3, 0042 (2023).

5. J.M. Le, C.S. Tian et al., A novel scheme for ultrashort terahertz pulse generation over a gapless wide spectral range: Raman-resonance-enhanced four-wave mixing, Light: Science & Applications 12, 34 (2023).

报告人简介： Chuanshan Tian is a professor in the Department of Physics at Fudan University, earning his bachelor's and doctoral degrees from Fudan in 2001 and 2006, respectively. Following his doctorate, he conducted postdoctoral research at the University of California, Berkeley, from June 2006 to December 2010. Since December 2010, he has been a faculty member at Fudan University.

His research focuses on surface and interface science, nonlinear spectroscopy, and the development of innovative techniques. He was selected for the "Pujian Talent Program" in Shanghai in 2012, and the "New Century Excellent Talents Program" by the Ministry of Education in 2014. In 2021, he received funding award from NSFC for Distinguished Young Scholars.