This is a past event.
Thursday, January 19th at 4 PM - Fisher Hall 139
Please join these in-person presentations.
Aaron Wildenborg [Advisor: Dr. Jae Yong Suh]
Sodium as a Lower-Loss Plasmonic Material
Plasmonic nanostructures can convert photons into surface plasmon polaritons (SPPs), electromagnetic waves that propagate along metal-dielectric interfaces. SPPs are useful for applications such as biological and chemical sensing, photonic circuits, and nanolasers. Noble metals such as gold and silver are typically used for exciting SPPs, however these materials are expensive and experience high absorption losses in the near infrared, leading to reduced device performance. We investigate using sodium as a new plasmonic material. Sodium is not only abundant in nature but also supports relatively low losses in the optical region. While sodium has had little research due to its reactivity, we demonstrate that encapsulated sodium nanostructures can be stable in ambient conditions for more than two months. Through dispersion measurements, we show that the SPPs from sodium nanostructures exhibit linewidths narrower than that of silver or gold, with measured linewidths as narrow as 9.3 nm. These results verify the advantage of sodium as a lower loss plasmonic material.
Lisa Eggart [Advisor: Dr. Ravi Pandey]
The Influence of Chlorine in Corrosion
Initiation on Alumina: A First-Principles Study
The US spends more than $100 billion annually on corrosion management, yet little is known about its onset. My research focuses on computational modeling of the initial stages of corrosion with the aim of understanding and eventually preventing material degradation. Halides are thought to play a key role in atmospheric corrosion, but the mechanism is not yet known. My current work examines the stability of an Al2O3 film in the presence of Chlorine. Simulations of surfaces and interfaces can be computationally demanding, and so I created a cluster model which exposes a variety of local surface environments from relatively few simulations. I use the results of these simulations to investigate the preferred local environment for Chlorine adsorption onto the surface of the alumina film and to describe the initial system response.
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