Christian Dwyer: Material Science Semnar
Thursday, March 17, 2016 - 9:00pm to 10:00pm

Using the transmission electron microscope to explore nanomaterials – the current state of the art

Christian Dwyer
Department of Physics
Arizona State University, Tempe, Arizona

ABSTRACT:
The transmission electron microscope (TEM) is an extremely powerful tool for the study of nanomaterials and biological materials. These instruments provide superb spatial resolution and sensitivity, with modern TEMs even capable of performing microanalysis at the level of single atoms. In this seminar, I will explore how the wave nature of electrons in the TEM enables us to vividly "see" the atomic structure of the nanoworld. I will describe applications of state-of-the-art aberration-corrected TEMs to uncover atomic structures in range of materials systems, including catalytic nanoparticles, light-weight alloys, and ion conductors. Finally, I will touch on some of the current limitations in the field and possible approaches for overcoming them.In this talk I will present an overview of these metasurfaces, both metallic and dielectric, and different coupling mechanisms that can be used for active tuning and enhancement of optical nonlinearities.