Novel two-dimensional (2D) materials have gained increasing attention due to their unique electronic and photonic properties. The realization of the optoelectronic applications of these materials still faces several challenges. For example, it is critical to gain clear understandings of (1) the fundamental light-matter interactions, which govern many of the key material properties, and (2) the coupling with other nanostructures, which is a required structure for devices and systems. This talk introduces new discoveries and pioneer work using optical spectroscopic techniques on these critical challenges, and novel applications of 2D materials in sensing. The first part of this talk presents the essential material properties investigated using spectroscopy, including interlayer coupling of Moirè patterns of 2D materials, and anisotropic light-matter interactions of 2D materials. The second part of this talk focuses on the interaction of 2D materials with other nanostructures and the related applications. The interactions of 2D materials and selected organic molecules revealed novel enhancement effect of Raman signals for molecules on 2D surface, which offers a new paradigm in molecule sensing. The works presented in this talk are significant in fundamental nanoscience, and offer important guidelines for practical applications in optoelectronics and sensing technologies. The methodologies used here also provide a framework for the future study of many new 2D materials.
Shengxi Huang is an assistant professor at The Pennsylvania State University. She earned her PhD degree in the Department of Electrical Engineering and Computer Science at MIT in 2017, under the supervision of Prof. Mildred Dresselhaus. Following that, she did postdoctoral research at Stanford University with Profs. Tony Heinz and Jonathan Fan. Shengxi is the recipient of multiple awards, including Johnson & Johnson STEM2D Scholar’s Award, Kavli Fellowship for Nanoscience, Jin Au Kong Award for Best PhD Thesis at MIT, Xerox Foundation Fellowship, Ginzton Fellowship at Stanford. Shengxi’s research interests involve optical spectroscopy of materials and nanostructures, as well as the applications of nanomaterials in optoelectronics and sensing.