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CAMP: Two-Dimensional Materials under Optical Probes

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Shengxi Huang, Department of Electrical Engineering, Penn State University
12 March 2018 from 3:30 PM to 4:30 PM
339 Davey Laboratory
Contact Name
Cui-zu Chang
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Two-dimensional (2D) materials have gained increasing attention due to their unique and extraordinary electronic and photonic properties. The realization of the optoelectronic applications of 2D materials still faces several challenges. For example, it is critical to gain clear understandings of (1) the fundamental light-matter interactions in 2D materials, which govern many of the key material properties and are critical for device applications, and (2) the coupling of 2D materials with other nanostructures, which is a required structure for 2D devices and systems. This talk introduces new discoveries and pioneer works using optical spectroscopy techniques on these critical challenges, and novel applications of 2D materials in sensing. The first part of this talk presents the essential properties of 2D materials investigated using spectroscopy, including interlayer coupling of twisted bilayer MoS2 and few-layer black phosphorus, as well as anisotropic light- matter interactions of 2D materials with in-plane anisotropy. 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 graphene surface, 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 2D materials in optoelectronics and sensing. The methodologies used here also provide a framework for the future study of many new 2D materials.