Abstract: Two-dimensional (2-D) materials have gained increasing attention due to their unique and extraordinary electronic and photonic properties. The realization of the optoelectronic applications of 2-D materials still faces several challenges. For example, it is critical to gain clear understandings of
- The fundamental light-matter interactions in 2-D materials, which govern many of the key material properties and are critical for device applications, and
- The coupling of 2-D materials with other nanostructures, which is a required structure for 2-D devices and systems.
This talk introduces new discoveries and pioneer works using optical spectroscopy techniques on these critical challenges and novel applications of 2-D materials in sensing. The first part presents the essential properties of 2-D materials investigated by using spectroscopy, including interlayer coupling of twisted bilayer MoS2 and few-layer black phosphorus, as well as anisotropic light-matter interactions of 2-D materials with in-plane anisotropy. The second part of this talk focuses on the interaction of 2-D materials with other nanostructures and the related applications. The interactions of 2-D materials and selected organic molecules revealed novel enhancement effect of Raman signals for molecules on graphene surfaces, which offers a new paradigm in chemical and bio sensing.
The works presented in this talk are significant in fundamental nanosciences and offer important guidelines for practical applications of 2-D materials in optoelectronics and sensing. The methodologies used here also provide a framework for the future study of many new 2-D materials.
Bio: Shengxi Huang is an assistant professor in the Electrical Engineering Department and Materials Research Institute at The Pennsylvania State University. She earned her Ph.D. degree in electrical engineering and computer science at MIT in June 2017. Her research interests involve optical spectroscopy of low-dimensional materials and other nanostructures, as well as the applications of nanomaterials in optoelectronics and sensing.