Special Seminar: Leveraging Advances in Computational Electrodynamics to Enable New Kinds of Nanophotonic Device Design from Enhanced Solar Cells to Energy-Efficient Displays & Solid-State Lighting

Ardavan Oskooi, Research Fellow, Dept of Electrical Engineering & Computer Science, University of Michigan

Tuesday, February 17, 2015, 4:00–5:00pm

Room 200, Cummings Hall

Abstract

Advances in computational electrodynamics have the potential to enable fundamentally new kinds of designs in nanophotonic devices which are based principally on complex, non-analytical wave-interference effects. Powerful, flexible, open-source software tools have now been made available for use in large-scale, parallel computations to model the interaction of light with practically any kind of material in any arbitrary geometry. These recent developments in computational capability now make possible the investigation of various emergent structures and physical phenomena that were previously beyond the reach of pencil-and-paper analytical methods as well as less sophisticated and even less accessible commercial software tools. Here, I demonstrate how such advances in finite-difference time-domain (FDTD) methods for computational electromagnetism via an open-source software package known as MEEP can lead to entirely new designs for light trapping in nanostructured thin-film silicon solar cells as well as light extraction in nanostructured organic light-emitting diodes (OLEDs). I demonstrate, for the first time and including experimental results, how the photon absorption of a partially-disordered photonic-crystal silicon thin film can significantly exceed, over a broad bandwidth and angular range, the well-known Lambertian limit of statistical ray optics that was proposed more than thirty years ago. I also show how a nanoscale texture applied to the metal cathode can be used to markedly reduce plasmonic losses and thus improve the light-extraction efficiency of OLEDs over a broad bandwidth for energy-efficient display and solid-state lighting applications.

About the Speaker

Dr. Ardavan Oskooi is currently a research fellow in the Department of Electrical Engineering and Computer Science at the University of Michigan. From 2010-2013, he was a Japan Society for the Promotion of Science (JSPS) postdoctoral researcher in the Department of Electronic Science and Engineering at Kyoto University in Japan. Dr. Oskooi graduated with a doctorate in Materials Science and Engineering from the Massachusetts Institute of Technology (MIT) in 2010 where he worked with Professors Steven G. Johnson in Applied Mathematics and John D. Joannopoulos in Physics. He obtained a master’s degree from MIT in Computation for Design and Optimization in 2008 and a bachelors degree, with honors, in Engineering Science from the University of Toronto in 2004. Dr. Oskooi has published 13 first-author manuscripts, a book entitled Advances in FDTD Computational Electrodynamics: Photonics and Nanotechnology (Artech House, 2013), and is one of the core developers of MEEP.

For more information, contact Haley Tucker at haley.tucker@dartmouth.edu.